Malicious PDF — malware analysis report

Static analysis result for SHA-256 1506e1d68c8636bb…

MALICIOUS

PDF

106.9 KB Created: 2021-06-26 21:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d2dfd8048e023c73bcaaf9feae1e098 SHA-1: 0500d8ea8820f59af0a8cc0f5f38e250a04f2fc1 SHA-256: 1506e1d68c8636bbc464433072fc188b552aec80af62b15243729a024d303efa
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5c07a4d2---13525783644.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a256df7330e---97573921233.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/735d5c05f84400fc5e18ccb0eaa87e16/26165328283.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfafa95d64---93724142452.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9cefc39cb---99114115125.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80b3b0363---85778614037.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fe4e2681---futojejilaf.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7687379---mawuwebogagavamu.pdf
    • http://mai-colle.jp/userfiles/file/nenusol.pdf
    • https://network-italia.it/file/7428024894.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tq0eglvtu7t21ison6ngr6akoo/32090363237.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1fa10b9---85629209380.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e6fa9eec---kuwozu.pdf
    • http://cec-intl.ru/app/webroot/files/file/vovunikibepexelulojagagus.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090933d761b9---65673161145.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/savaninopowukubav.pdf
    • http://asvpp.fr/pdf/finunerilu.pdf
    • https://studiovizia.com/webroot/img/content/files/gemumimo.pdf
    • http://www.celso.org/download/rukemafawafapejaxik.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j06hqgja0modmkmhf72qo4j1d6/taxob.pdf
    • http://teplospectr.ru/images/files/91002915174.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/90595205734.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df52e0137---kenaruxofipukukumimepusa.pdf
    • http://stacjaregeneracja.pl/userfiles/file/ditavusevubemagujuvudinub.pdf
    • http://growlink.biz/userfiles/file/93669332307.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=determining+state+residency+for+tax+purposes
    • 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_off00013ffe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
font_01_sfnt_off00015810.bin
2de003b5587cd308c63451c159af25594b6db0490929f717a49d1bc671839105
pdf-font-stream PDF embedded font (sfnt) at offset 0x15810 16772 bytes
font_02_sfnt_off000183a7.bin
dde1c6d47a7fc68f604f5641242bac915b3c3daf722552e96d05f2054b9ba4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x183A7 11236 bytes