Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa2d7094098231e…

MALICIOUS

PDF

96.1 KB Created: 2021-06-26 23:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33f76b176084eedae96966ed297500a5 SHA-1: 4c6f77b6d36b8948910786d0c326a92f69c1e291 SHA-256: 3fa2d7094098231e5f589fe0cfdb748575154faa8d52fb5d37f2c1bfa7c6893e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These sites likely host phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://inwebjor.ru/uplcv?utm_term=the+wolf+moon
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/00765b2e4303a75c43e6cac69a3f54c0/5282928821.pdf
    • https://prawobrzeze.info/userfiles/file/39227257146.pdf
    • http://ccswcd.com/userfiles/file/89274718493.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb86e0e309---dewejazevizuxireraketu.pdf
    • http://cepsagibyachtfuels.com/images/photos/gedaxekajabefatunowise.pdf
    • http://szentimresiklos.hu/upload/file/vujarujiduzoxonokope.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/qqaci63tt8qsf41pqdvh1b6pr5/jofufumeranubekapabepojig.pdf
    • http://beerskiboot.com/img/upload/file/86839060189.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ed895de4---31040154709.pdf
    • http://spreewaldatelier.de/img/editor/file/22881583517.pdf
    • http://senseoftourism.dk/userfiles/file/roxozigebapev.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7ee54670---vuzimewuragawimuf.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df445424b---20606371488.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25e90f8d4---pifuvalodikur.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/fetofufupam.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a470913c66d---dejevibakugozogidunetow.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081d149f7f---kiduvomiwiwuza.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/nagilowevigalatavipofofe.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d38c06c5bf54032d153bc590ef9043d6/74809914048.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d16a3224c2b0685ce3c8255c76d4a20b/depudavinizip.pdf
    • https://webmenuplus.com/images/file/vunuvowuxokofobub.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29da0a6e9---77444940494.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fae98d7594a169730da74e79d8985d87/66605746407.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vnvd6mh6br4b024t9u5n7bpuki/gikukobalikofepozigida.pdf
    • 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_off00011813.bin
e57be260cb295650340fc549e1fbd88263b9732049eb6d7cf752f234af6618f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 17104 bytes
font_01_sfnt_off0001441e.bin
d0f5ad5324238995badc81af3df06fc2385a22a5645cd9e2e105bb86fd491a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 9908 bytes
font_02_sfnt_off000159d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159D2 16792 bytes