Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcd7aa7f4862304…

MALICIOUS

PDF

77.0 KB Created: 2021-06-23 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3fc1cdd69579019e4777a199c143635 SHA-1: 5d59b1a3a9320de68b620b94ea0ab7529207d27b SHA-256: 1bcd7aa7f4862304ea6d7de46b2905b8f3a851ae3057b323dc55f99db7e59468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=free+fortnite+codes+for+xbox
    • http://klpa.net/userData/board/file/80934671117.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/zigibefuwuj.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076daff8830a---38123828205.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/44fc893de8f1eb430c07d2a6985548bf/maxel.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a37bcd3f---puwutilixenepi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b0130c991f68b4b75e17eb507247de14/bogolubude.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df64463761---21074952992.pdf
    • http://zabradli-znerezu.cz/userfiles/file/dobaruxexiregabun.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609488c7e0b1a---lobimumufa.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/91d5d7bdccbac691637e02acb2443cc8/86423621441.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hkuvdcjqljmcto61gqgutoh7r7/83866243301.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bf420661072df92257ed30b792845681/26409479811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d8.bin
98b06661d2e595cc32f491222400e377cd54b25ec8a80057f3be736579a3b23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 4936 bytes
font_01_sfnt_off000104b9.bin
7f3411dfe3ce1819f79df2d4159693843df6a301938e56b7c4edef4d691b1463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 12696 bytes

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