Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80ca46f0bed38be…

MALICIOUS

PDF

92.9 KB Created: 2021-07-03 00:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 017334b3b89aa9fcf7f3b23fcbf369da SHA-1: d211a60994f5cc1837f2bfd507adc6b738c30281 SHA-256: d80ca46f0bed38be940fd0fe876077e209016f5acc81b3690957b9c7fa4bb6d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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 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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64866a3fd---77071796036.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3accd8938f4073f815456c0a5b275f59/48143981159.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082af88dcaf1---9254758616.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae5cee5f3---xozufepu.pdf
    • http://metafelix.it/userfiles/files/37787230630.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a472329ca85---97624076178.pdf
    • https://anmoul.com/userfiles/file/mawimez.pdf
    • https://meganimal.pt/site/upload/file/97287810150.pdf
    • http://morethancars.nl/uploads/edytor/file/85209230367.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158b40c20e---dowuwuxojewido.pdf
    • https://schmitz.cz/res/file/dekenoroxugerudawojo.pdf
    • https://buka.ru/sadm_files/68710173090.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/b3e23bbc0d54cbc1190eccd6f1b82ac4/merebefasariraginuweku.pdf
    • http://av-jet.ru/userfiles/file/jezubogofevigebelojidiza.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/73483447445.pdf
    • http://oreade-breche.fr/userfiles/file/730680165.pdf
    • https://angkoronetour.com/userfiles/file/pusajoxelopunuwivu.pdf
    • http://brette-animation.com/userfiles/file/pabirozokefakokoxid.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6b2033fdd---11591161462.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/vaparisebu.pdf
    • http://fandimnarodaku.cz/upload/file/folefir.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f9e7a102---92274257196.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f3416739---74389559526.pdf
    • http://granite1962.com/clients/869125/File/vetivaxoburusoxif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+play+cold+war+zombies+alone
    • 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_off000104c3.bin
20cc6230cd660e15dc569dca00eed5b4f9d275c35ab2e3ee201054715fd540f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 11068 bytes
font_01_sfnt_off00011e5f.bin
eb815fb75576a477190f53aac52159af7d6efc4d360822ea1d55f6d16eb3cf3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 18308 bytes
font_02_sfnt_off00014e4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4F 16792 bytes