Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a45ecb4d1694572…

MALICIOUS

PDF

85.8 KB Created: 2021-08-12 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9d82f8c33bcfa998b3c8595a9e34298 SHA-1: 83b8e3e4f13f78e3b53322f9ef717cd7ce7fa3eb SHA-256: 8a45ecb4d1694572974a11a62f1a43b9ad18a00239c49351e913f866e9fc5e82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many of which point to compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The links are designed to lure users to sites that may host further malicious content or attempt to collect sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=valid+credit+card+numbers+with+cvv+with+money PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d42d4f2ad---3673713391.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac797809b6e---39492417109.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/wirekukutonodolejesetet.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/80359390542.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff920c32aa---zugusakibe.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/95082305984.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/081c39d3e0c7bb46e59cb2e23acf06c6/56636404725.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/626497134609f0e38445dd.pdfIn PDF document text
    • https://pecsikult.hu/files/file/95922062942.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7911cff98---976936202.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/giliwisifevaxiwiji.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f81ec7cacd6b5276d8768657779598d6/jadidanebapiwuzogubebaxug.pdfIn PDF document text
    • http://computerdoki.hu/user/file/94733262621.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b14ccbd2---4350875604.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/14489525991.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2d7d18ed79709eabd23943c89936f9af/kadalanepa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7b8b5660ed01be530992cab3fc07d68b/14939861707.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/paxuditomofemezafuba.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/98933268277.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f5c94a279---20867688089.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abeae88b247---tilewiposugadijuvowoketaf.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/32613148194.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074739ae2aaa---62131000521.pdfIn PDF document text
    • 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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 17224 bytes
SHA-256: f889a9ec6aa6d71d1a2e32dda2242d4e00709a1138111e84f254f389b41f2804
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 11108 bytes
SHA-256: 8bf78fc36fbe8610d5b6102fc11bfb51d40d40f12f29e83a14bc3a3ff659a3cb

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