Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0d1496349ff168…

MALICIOUS

PDF

92.1 KB Created: 2021-07-28 08:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4b5993e8b3d78d5b75b26c4a5be0810 SHA-1: af1e0703dac7397b28ef80a64eac9c6f590aa961 SHA-256: 6f0d1496349ff168269a240a33a63dfa2d95e09359808bdab0193da15360ee44
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, a common tactic for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d5c440b305d70f6c19a6c03f4ef8f5b3/fuzitonolisosonalubi.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ed2f1227b236c90c791d8059c574df48/jedakok.pdf
    • https://erdemlerkoleji.com/resimler/files/gegux.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/e027d896ed37a832a9e25d59f91b3f0e/56438807459.pdf
    • http://preciz.com/uploads/wysiwyg/files/degijirasowoferabojagu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/65bd7eac848c5b3b88810f30bdb754ff/bupitusaganapuxiwilawukok.pdf
    • http://animalscipublisher.com/files/upfiles/file/1938541507.pdf
    • http://jrpst.pl/userfiles/file/wabezumiri.pdf
    • http://indecomavo.pl/inc/46965728679.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/38378496226.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c22e20c0---jodidepazavorunu.pdf
    • http://studioarchterreni.it/userfiles/files/faworajage.pdf
    • https://inncredel.com/uploads/84000759975.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aed01794408---jaborizizijo.pdf
    • http://bijverhoeven.nl/uploads/files/guwevarudepibofimasapup.pdf
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/36620808967.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d31b7d904ad38a37e197660da0e95c48/1465800598.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4f88f526d1780f76a4d629b613a622a6/nigejedabujusalazo.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4314253e3---dasadidoruwomegexetewajo.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4616aa739e---savobujasogixolezuf.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ke0fkmudciedup682r2rgkmdnu/turodefuma.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc702851c14---95681501902.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+children%27s+hour+act+3+summary
    • 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_off000101a8.bin
922d806c64842a5ea461197398f157a82c67059b22ecfb430c5f6158146dc70d
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 11020 bytes
font_01_sfnt_off00011b2b.bin
437b04aacc116f902ac6c45518b787f3d98882a047763b01f628d306edee2072
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 17316 bytes
font_02_sfnt_off000147f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F4 16792 bytes