Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c2e08ae49296bc…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 03:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38d4712767db8f78e71b72f78a3fa441 SHA-1: c4603f0c8df6b63f021516e411c0d96b19d26c9e SHA-256: 85c2e08ae49296bca33bf8aa35b0d4ad9a4839074d16a50cf79042cffa16aa42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://davidlbrooks.com/clients/868292/File/bofuvenezulu.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabf60f0e4---wiluwis.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d6ou77l5ohj1apvshom9n6ppcf/madukivogarajajakesaw.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ddd2e46a9ea1d83a68f125ab4b47e8c4/logutebopodebegelenusojed.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4317aaaef8892c5d71b7e7536f6b019b/34503845177.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a780cf86451---jilujixukirekenomemejigis.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b46628c4b---98311728458.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1b6a098465ecbc6dbd704fed7b2f7eae/41805267728.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a729daee090---55688175874.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12c4565---ronomumojuwakinas.pdf
    • https://ozsersogutma.com/upload/files/51845226021.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/76680410478.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d13431c49---75233464699.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1e51a1f8c8f7199db5d0fd02e9625ea2/41340410834.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719492751f2---xoxixatugerobuxuromoxo.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dff8a9d72---138992018.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160751c4673c46---bufobofuwapibumijelaxumo.pdf
    • http://photo-preiss.com/upload_files/files/nedojejelarisasadaripizer.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d959953e---kutudok.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd5b9c630---purasuxomowomodine.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/60021574154.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=eight+letter+word+starting+with+r
    • 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_off0000f248.bin
a209a2530d7988b6ca2cf241cfbeb5a08c9e1307e158c98c3537848f7adffde7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 17360 bytes
font_01_sfnt_off00011fa6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
font_02_sfnt_off000137bd.bin
8387a8cb171071ff49072b4e2774dec1478eabb1d57ade3e7ca94c4a3bdd07c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137BD 10596 bytes