Malicious PDF — malware analysis report

Static analysis result for SHA-256 a894e1f5b2af48b0…

MALICIOUS

PDF

118.5 KB Created: 2021-07-25 13:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c61731e6e7887b7b635da4b4d464110d SHA-1: 9dac962613d34066e46675755e913fdc5b894d38 SHA-256: a894e1f5b2af48b0436c3272b505388fa1b7b9645569ced62b2a8a422c773f37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/jisepasirizupubega.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/6772939911.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30fb130001---fumowolemaj.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c304c639324---jikotis.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0751e68d3---96520566376.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732256e2301---defesidim.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/corubipdrd50gvtuejivais5lp/68086800843.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/70175afb318a6b91e52698dfe3e13944/46859283460.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075baa44c873---dijaxilaluma.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac943fd3424---labokimemalagedowukoxufit.pdf
    • http://belst.by/upload/file/xezuj.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/28235300324.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7889fc6385---zaramebaxurup.pdf
    • http://extracam.es/app/webroot/arxius/file/82021560352.pdf
    • http://brooklynsmokeshops.com/admin/images/file/40335771687.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09dc68e200---33091130730.pdf
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/wepiselajotewugiveteruwak.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/o5hlkomm92r72m4f1g9tj2r9g1/selawulovuru.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/bd0b64cf11b7cdca520fa9acf50a727e/zeterezebur.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160765638709d7---58523513289.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/1335926429.pdf
    • http://mintaialuminum.com/d/files/80891468650.pdf
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/wexirutaregatupofumev.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/e9g3ecc909t68tf78ufp5m1e05/58146942163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=is+starkiller+stronger+than+luke
    • 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_off00016c3d.bin
e815c6d0a3e1d04977a317a660dd3e443453cfeb60f3d46c4a2920707ef50acd
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3D 10532 bytes
font_01_sfnt_off00018427.bin
764fff6640b5e7da409f2e9d2de9a8b34db8077c43b6aeb1050aff1c3ccd883c
pdf-font-stream PDF embedded font (sfnt) at offset 0x18427 18492 bytes
font_02_sfnt_off0001b437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B437 16792 bytes