Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c712228f7d5c3bf…

MALICIOUS

PDF

96.7 KB Created: 2021-07-02 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 947193de0f94658c56598b08e0d02eeb SHA-1: f5b3d16df4604df772ca88d959b9e51d3462d3a4 SHA-256: 6c712228f7d5c3bfb8d165ceb3543f8becbb47b21e1c4a1f73a19464d98a9161
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing infrastructure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social engineering tactic for credential theft or malware delivery. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://smidgel.ru/uplcv?utm_term=funeral+ceremony+meaning+in+kannada PDF link annotation
    • http://fashionflutters.com/ckfinder/userfiles/files/kawubevomoz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0797105c---novejagasajugisu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde9a5996f---batokewezaresozomob.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/4056856212.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/populigesapuwajizanaku.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0380d57d---pasuwonat.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5iiok6skgnrasj0qvegm7c637/55231889934.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce910c2bc---45678845421.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ut835k5uqd8e6lgfdu7gjrna81/tuzulowedogixaru.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/74860a671191dbdd1b83888bd5b265e9/44025079963.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/redanefapovozosawigomusuv.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608421a84e667---jusajevebovenez.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/labowotexepoze.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984563bf151---dipivobabiluvenux.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68dd40cc1---jejuvoxipuwasexu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/m7inl4n0rj3t6ud9akeu23ka6i/23590275190.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/63893cf803c8410a29577620f6476f86/mevaramakuwubi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/54a794e7eabd1c836ead0bb0f5210662/17399499904.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nntpe3jmccbbdchoum2p3q4etn/54753833096.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xunodigipowowaxelepa.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/83776880124.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9578562f9c487504d89dd7a50ced422b/79222525262.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a8d345c2ac7db3873d8b38a0401e6029/98740624067.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_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 22444 bytes
SHA-256: 93dff516fc52c432991b508b654e2afd3e3cac9f722dc5385408ee1b7d0be322
font_02_sfnt_off00015b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6C 10728 bytes
SHA-256: 48e717f17eaa79e04813caba73a792ebeebf885de5fb22f5f98cdc7f7248ee91

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