Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0db9cac638211…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 04:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d627781c7e8a112bf3c9ac1d620aa3 SHA-1: c1e5b8df01c6bac151b4dff375fbe68d3b0bf972 SHA-256: e1f0db9cac638211c4c464240c1c7cee2a3df330d269f0e36260bef798bdef22
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b29d0b01---mebat.pdf
    • https://chptravel.ir/data/file/faxowojotud.pdf
    • http://gd-weimi.com/upfolder/e/files/20210730164523.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/931307ca76cee2b99f8a71db9c007af9/devakadorisasize.pdf
    • https://themis-lex.com/userfiles/files/kijagewasekazoviveku.pdf
    • http://take114.kr/FileData/ckfinder/files/20210724_0592116B49A2D7E6.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7b0f17abf---33730950786.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf05300a29e---64951674457.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/xilupum.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/57533567396.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093be707d087---jisigo.pdf
    • https://horkolas-gatlas.hu/ufiles/file/tifufa.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/mimexuruwi.pdf
    • http://hanilkwanla.com/uploads/files/fusoxabekebe.pdf
    • http://caramelitos.sk/files/19858547050.pdf
    • https://abofahed.com/userfiles/file/56781108999.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a307eb076---14666558092.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/winutoromoloramowa.pdf
    • https://nevisnews.com/userfiles/maxelonu.pdf
    • http://www.tobywells.org/media/fckdir/file/95653269.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94872a8ce8---60261154910.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16125b6f4d7b14---xezizebokebodugeposi.pdf
    • http://birnagarcollege.in/userfiles/file/7428846352.pdf
    • http://gamax-motor.cz/data/dokumenty/2567157726.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ou+revaluation+results+2018+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_off0000dbe2.bin
ba6703433c3bf5e2975e2a18c35a6979f5a57bf05c0f5cfe6b8fc7d2fbe8f5b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 11184 bytes
font_01_sfnt_off0000f642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
font_02_sfnt_off00010e54.bin
35d3e032b4dc4fdce9ef703ae744c34d8d83de480a3298c67752589abbb92d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 18868 bytes