Malicious PDF — malware analysis report

Static analysis result for SHA-256 566766af29c71fa2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 00:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bb62979235566391b5bd9795c779071 SHA-1: 0381e2489a90b33df93a06b76908673040fcc46b SHA-256: 566766af29c71fa2c8bddbb3bfa5ae9230cc8b7da1f214a4338ceed4d359b321
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan threat. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ti1vpt7ka6eav8c139tlgqc0t4/26718277551.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17758493b---dijuzatus.pdf
    • https://annjulieskarpmo.com/userfiles/file/27354231262.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e8926303---pipivadarukusoneve.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b162475f7cc---bomefez.pdf
    • http://timeyear-v.com/userfiles/file/tobuv.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4k259fvb56ivkgtou1frrl2p7c/radovirumebirudoranawitig.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b69283dc204---nonojujetevalererelowav.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a48c6a78de9c06a2c61dcf00d36367a7/gosibisefejakebil.pdf
    • http://asbufestival.com/uploads/FCK_files/file/geteloninewupepalira.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qvc8r4jguak3cmfccsui23bolr/67139583786.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b0ef32e2---2258394397.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeecb57ace---gufemasivosigigejov.pdf
    • http://agataklimowska.pl/userfiles/file/mowukelafemokobiwovefobe.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4f575b54a1c4099b7b715b005634fcae/68103606985.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8ngh8gsm1r3e1884350kd3gr1k/zogor.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b1a4a1ab8---fulanujuke.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/lonajifolaxizu.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6946b74dee96af8d7a173dece411079b/nufopedubaz.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ah4h3k1tdk5kkt4tvib193du0q/92715615560.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a03fdea8f72c6d167457b83d7ed6918c/xufegifijidu.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/45887e96f49facbc484d37de7a91dc11/95571013738.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=non+exhaustive+list+definition
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27c.bin
74212633ddccecc3506ed011985727ef2409fee5dd09695b85e63c379579a5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27C 10596 bytes
font_01_sfnt_off0000eaa7.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 16060 bytes
font_02_sfnt_off0000ffba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
font_03_sfnt_off000117cc.bin
e557dc9aa1677c3709b8a9b2e23ce19dae6578964e39a2ccb0bf42bfb4ea1818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 18296 bytes

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