Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1db16861cb3ef7…

MALICIOUS

PDF

81.2 KB Created: 2021-07-15 17:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cffbf38fdcc43d3f6b5897004258754 SHA-1: 5a28f8b63bd910b47123175f5fee747e7f760dde SHA-256: bf1db16861cb3ef76eed0abdb35d38bb6a66de99c76836d7ce5af9b9788f2c89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, likely intended to host malicious payloads. The heuristic firings indicate a link farm strategy, with many distinct hosts and URLs designed to distribute malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=avoid+meaning+in+bengali
    • http://innotack.com/userfiles/files/66300424431.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aa328ce98c59b8bedeba540ce0d48d26/mafipite.pdf
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/povabijabenibufavap.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dqvscocasuoh1vs5rvnc63svtr/91402764122.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/31678101605.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc338accc89---zutos.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/16180786599.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ccd19a38---91710306275.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1907a3a198f4ef9859e9eb7d6bcb8a84/5156786035.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/33f9006ef390239c22065509167ad8fb/vuxabodarifaxululonone.pdf
    • https://cs168.tw/upfiles/editor/files/xomajafono.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2495e95db---dujowivinaxagesotetabuji.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/94eea1cfb5f81356821e5685d036235c/kokidod.pdf
    • https://ambulatorioveterinariosismondi.eu/file/benamumobalijojasob.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23684859cf---tuxanozusomegog.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4789025982d4839e255955e82e2b14e0/tawezelefenodilivesive.pdf
    • https://condominiovillage.com/userfiles/file/zibalop.pdf
    • http://xn--9w3b11kh5l.com/ckupload/files/fexar.pdf
    • http://amadpich.com/userfiles/file/5910060810.pdf
    • http://www.odnpoznan.pl/fotki/file/file/zemelobopobigid.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084082d13b3d---biwozixega.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7ed4la2amf6s8a0jfo1a8v4m1m/62281429448.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/tajunazobikeborugolu.pdf
    • http://119pump.net/d/files/jetufabotalotowoduzigew.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_off0000dcf0.bin
b46a7667bf5a09c137db619aec5d4f970f8770f5062abd78d159c51452f903f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10412 bytes
font_01_sfnt_off0000f43b.bin
75e744862178dd48553af105cf2098f121fcc353bf7e7b86eea203964de3f04f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 15968 bytes
font_02_sfnt_off00011d56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16792 bytes