Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd52031440b0e3ac…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 02:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfaca7fca47c4e5ab0fafa8bc48bffe2 SHA-1: 3ea01f66127e0e53669bd7c411a94af05c720f3b SHA-256: cd52031440b0e3acc936ebeb9b063545ce17fa55b3eb9097f082f8f7219a827d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02cf086b9---kafelixepejesegegaribi.pdf
    • http://u15.ch/ckfinder/userfiles/files/57472526389.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160985bfe32277---zisamofomoranuwo.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c150c9f8538e623206d13461c3c093ad/ragiwedizemidalofu.pdf
    • http://www.deco-interieure.com/userfiles/file/zavepef.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a67e26e3718f9770ce069e0941ef8254/lepowonoxalivaxuvad.pdf
    • https://kfmaccounting.com/webroot/img/content/files/30768343186.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903213851975486.pdf
    • http://v-lukomorie.com/uploader/files/27446746207.pdf
    • http://abwlargo.com/uploads/files/97254075719.pdf
    • https://giustofiori.it/file/dufepuzaned.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f122e25986e---38876492864.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d62fc3c0717da307a8fc00e9e7609ff9/18592285108.pdf
    • http://954move.com/clients/4890/File/61661623164.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772043b9681---71485337566.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca75fe3c98---49233307833.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6c1efcaacd976a293e97380ee2eafb1a/3755478043.pdf
    • https://heritagecambodiatravel.com/userfiles/file/99841896110.pdf
    • http://standartbio.com/fckfiles/file/62700099970.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/aa0qh933pumues55rq7epi4a13/vevigokiza.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814bfd3cffc---linidijaligibimovojefidam.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/81381595660.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/gugavisejusotuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=non+performing+assets+in+cooperative+banks+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2b.bin
b3385ccb4d33b8717288334d8e0f6d1e9127f0b0fa07c10b273bc75738deefea
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 17004 bytes
font_01_sfnt_off00010ac9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
font_02_sfnt_off000122e0.bin
bbc95dbcc5670ef4fafe2bc783fb9d8f2cc79456ea01f9a0850e9412d5cbeb4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11192 bytes