Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9a25649a4e4383…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 05:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 241a22802d6c128e3ee2e498685d067d SHA-1: 5aac314f10c2cfd2db800db33e6d8b04f07a5715 SHA-256: 3b9a25649a4e4383001ebc5c5720a8b274d37c45255deb3c9a7de91e6eeb3b21
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and threat intelligence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=prayer+before+reading+the+bible+pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77838a542---bopax.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b37563cba183be9c107d84c5bdf2bddc/66539207683.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b24c1abf3---kumokasunadakonu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6019c4bdb---bumopisaluzikufotunot.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096363e78907---vujupoguw.pdf
    • http://hagelkonzept.de/userfiles/file/75524796771.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e10c0de64c03727862915e409357949a/javuvanuv.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5b1dc211474b291c37cd3c53bc6f204/88489474407.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0248e804---poxagasugixuvebimufif.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfeeaf84c---43996159791.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a71775edd47---fusawajomuror.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607963a27188c---36304125981.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1beb99865---fufitomubodomifej.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080862e06183---balonebikemenur.pdf
    • http://madveras.com/ckfinder/userfiles/files/76922884625.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/lifopen.pdf
    • https://foodvellythailand.com/upload/files/xabekojasejadupu.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fuv377elqq8hopklf28ousaclo/16623936146.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210606132412.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cd3b55b19---luguwopemodis.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/sujinenefesulaxupifu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/60bf006391dd37ba5b825080f8c651cd/rakerapovejalesoj.pdf
    • http://sklepjola.pl/userfiles/file/nolumo.pdf
    • http://adainst.com/uploade/files/20210626091736.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_off0000e8f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
font_01_sfnt_off0001010b.bin
2afbe3aefe9e68ee80cf3deeb462c0925d2804551344da28b179a877bd50fe49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 16624 bytes
font_02_sfnt_off00012c42.bin
66f26b78905d8a12d6233149ae43455e29a93bdd3ce0b172a77caf2be9bfba3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 10864 bytes

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