Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1ac2353463e719…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 23:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6466c4af6afaa608840e7c9761ede046 SHA-1: 4d128026c725546bcc109032c44602b1c0d46ade SHA-256: ea1ac2353463e719d471122f1b2978ad11b502edaabb050ad852ebe84c503a8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links or potentially providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=anaerobic+glycolysis+pathway PDF link annotation
    • https://atl-50.com/files/file/33412436336.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/tudigawasopopogagor.pdfIn PDF document text
    • https://tebra.si/userfiles/file/xejoxejejubewatekodok.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vpc03v7ad9kc24gqc2asoukvr4/virabolulupagamoson.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/fusebuwoligebe.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/87824347429.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f707f90715---83411201292.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e321a824---nolotazabakonotifixume.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f31fba793c5ec1702166ccc700578b02/87388404232.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021080111412673499.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fovekevuweroj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64672b13c1---libotosopoponaxikijofof.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/fidutamibulakorota.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0db6decf20---nuwosarimojimegupilafu.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/89534655594.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/xipuxotuxexigasawabig.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/go3gtsirus541tlcvbmhsgtoov/1752835845.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c5c67cd6---vifemutuwezoporajisojaz.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/18813391706.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/109966914660c25dc5796f7.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/7ea43082b67dd0ebc2c43bc8937bf1dc/9593203384.pdfIn PDF document text
    • 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 10972 bytes
SHA-256: e30b23fe4d076952cbca3c69cf8ab27fd5b950142e5359b2da13bbfed4ccd186
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 17984 bytes
SHA-256: d1ce8c8c504ca531fc0d284b6d465b28ba0543dc36d9c0bdf384d6a3e1aed48a
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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