Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc37bff45b5325…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 08:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 482f84af64059f8377df0025d537bdbd SHA-1: 843064e956c0b61d75faea84b9ea65c3b32d74d5 SHA-256: a9cc37bff45b532533bf622d31918ca0b9d057edaa3e47b2356b0b13686a7577
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is part of a campaign to trick users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://greenvalleykerala.com/ckfinder/userfiles/files/bowiwixas.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ae97ab1f0e9e1bb958cac11bacf8f50/nisiwujadesopokagav.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307b6f1c1ac---86583340388.pdf
    • https://urbanshapes.in/userfiles/file/butijulefajekoveda.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/fezax.pdf
    • https://red-adlay.com/upload/files/75155087751.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/60962194595.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b1d8bbf3a060262a58df0198e4ca3c8c/18528023602.pdf
    • http://pathtojanna.com/userfiles/files/15561512921.pdf
    • http://canvangdientu.com/images/file/48013118050.pdf
    • http://serdceprirody.ru/userfiles/file/59782411891.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a60177bf---26095339827.pdf
    • https://purmoradiatoriai.lt/images/files/netun.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/36953150876.pdf
    • http://bptramptour.pl/files/file/366504311.pdf
    • http://www.vljainandco.com/userfiles/files/12030980976.pdf
    • http://snft.ro/media/file/ragoxozinuri.pdf
    • http://turchifiltri.com/userfiles/files/51990040166.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/duzusewezikukevodowa.pdf
    • http://turbotechnik24.de/userfiles/file/43787071029.pdf
    • http://karpatskiles.ru/store/files/69776916001.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/borunudatefomudoj.pdf
    • http://nusratali.com/userfiles/files/3637753892.pdf
    • https://adium.ru/userfiles/file/37436080371.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+note+recovery+download
    • 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_off0000ebbf.bin
76bd98d07969b1f4af37fd6fc300f3059cd108a16969d43303ac69342b803374
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10444 bytes
font_01_sfnt_off0001039e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 16792 bytes
font_02_sfnt_off00011bb0.bin
ca373172128009cb57ce8b856de7fdb284c29c802238ad88d3b28f731db5b04d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 18104 bytes