Malicious PDF — malware analysis report

Static analysis result for SHA-256 968655e572d3be18…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 06:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc44b5dc912b504bbd1b9b25fce43de6 SHA-1: 7dbd28676d53f2ba1df0e51feb0347927ac8c983 SHA-256: 968655e572d3be187dcbc1eba7ce9377be25a7b99839a350bdf74b277f928b67
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b75eb2b46bb8b151d590a66bc8201fff/vomoker.pdf In PDF document text
    • http://solemarservizi.it/userfiles/files/41131932264.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/26812281203.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/95509690662.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/83119767900.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/woneleveluketuguvebopepis.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/87653986340.pdfIn PDF document text
    • http://korytnica.net/data/files/nafizunifesoxeruvotadazif.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614280fe1b2b6---69599628352.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54543850dc7e31a7dcdebf4f6f987c84/94216362041.pdfIn PDF document text
    • https://gilbertems.com/videos/file/kakafuvegovonuzexaga.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/52550457718.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kolej.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gimunomijepavaxeruzabu.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/83680260010.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/sotuzuz.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/87009574494.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109051947257917.pdfIn PDF document text
    • http://baove24h.org/upload/files/juvivixegu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/72260758312.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/libogosobonadakul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=disable+app+apk+no+rootPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10476 bytes
SHA-256: 3dca908581dff166b3384e3a32001f50859a9afbe87ddd92e91b1a9fc714276d
font_02_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 17556 bytes
SHA-256: fc3e932119f3ee431a932f97424b2bb81d49523c2f0c0488a8dbe455dc35b3b4