Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4f59fb4814bf3…

MALICIOUS

PDF

83.7 KB Created: 2021-08-11 02:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9bdc00df319faf42014312a14634568e SHA-1: 97f71df5e7dd2cdd9c6335942aadff7a0e14c97a SHA-256: 99b4f59fb4814bf33b628e44de01b891285d0031276de0475b80c2d9422255b2
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, including a specific ClamAV detection for Pdf.Phishing.Trojan. The presence of a visual download button and callback lure suggests a phishing or scam attempt. The document contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=praiz+rich+and+famous+instrumental+mp3+download PDF link annotation
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rhoqmoh8la9smqv1br50luq0u6/33447078286.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55647121563.pdfIn PDF document text
    • https://kopari.hu/files/file/24386329836.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc2861fb8f---6208685101.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/f0qh0ju8h194m78cch3a9uso0e/xepaxojofuzoxiwuwif.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fazis.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5bdgaspkj6cbrhhrjcgkf8q37v/70428821103.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dusaziratoja.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/gokikusumalaj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60b490685---58434167600.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72728219024.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1c034822---52368399726.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dv72ve8nkm0ptosucuccmd0km5/33389229254.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836bc7da49f---20428910452.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad9f08f6---jefirite.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/93959588584.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jufebopov.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1c923cd712b4400a5b95b9da54fe60e1/84584178202.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zajodir.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/57747552023.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/96848808684.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f7460a4b---26557798041.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lchfr29j3j5s3u0mj71rc8a3f5/lobinusozuwuxefikepizi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/nirevudi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc1b42cf64---81749580233.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/pIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 17636 bytes
SHA-256: 596a515479b614cb05a057e1e6967a10867f707259dd288f3fd685a87714ac46
font_02_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 11304 bytes
SHA-256: 6208c1a86cc67c72e3524dfc86c88d8de76a41d504ad38f01c44e6a4428cfad2
font_03_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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