Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42602f4cf88b8c3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 07:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4fa184aadad632e9cc3651904666160 SHA-1: af79fd6bf402b79d0ee74ab8834f59efa2067f3f SHA-256: b42602f4cf88b8c326374a7fb8a1b7ceaff6b2b6c4487f72eb868baeb8c78db6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it is designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with a PDF-based downloader attempting to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/40943326457.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e35a586c8---lulibekavufe.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/13408548371.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/ganosisirepexufifix.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/50483432050.pdfIn PDF document text
    • http://lulanjina.net/upload/files/92936934134.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/78978693784.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7dab33c11---ruzigufumobezekumo.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/70115714703.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g3omolecnhqb8a3smj79dnas84/petiraxub.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/sasuzilewilukunaroza.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/af46828328c5f0c8d8180317d28819e7/23593873260.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/82548517735.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/n0ldgsmd3rksqt5tbio8k6hbbg/36966697590.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625304058.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608595b8cc1d9---59102337134.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/73750327963.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/26690234852.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/96077122650.pdfIn PDF document text
    • https://clinicscrm.com/img/files/kaxegiberujedijadi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/69e2807529b55b9ee92bb169b0fc63d8/razaxigutu.pdfIn PDF document text
    • http://medicentrumbs.sk/spravca/ckfinder/userfiles/files/79599575956.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/89548510959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=up+board+class+10+english+syllabus+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 11336 bytes
SHA-256: 561d081a98fd742c32c4194b670a81256d0dada06b14c0339bbe38be4ef18910
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 20132 bytes
SHA-256: 8ba24aad9d470bb6a0dccd34b045da371aec8dac2776da82c417a0cfdc98b8f8

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