Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ef043e1f209ae4…

MALICIOUS

PDF

93.3 KB Created: 2021-08-14 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b2e56cc05509df89fa3c96c4560adbe SHA-1: 413dba281d7e8e05f226e6daaeb4ece72f13188a SHA-256: 65ef043e1f209ae4b91faa86258e6c86b8aa9b768420962170ef2e6b8997a00a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier with high confidence. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate phishing destination. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a Facebook impersonation lure with a call-to-action link pointing to 'catamma.ru', confirming the phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://catamma.ru/uplcv?utm_term=propresenter+7+free+motion+backgrounds.
  • 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://catamma.ru/uplcv?utm_term=propresenter+7+free+motion+backgrounds PDF link annotation
    • https://gruppopolidori.com/upload/image/file/50151739746.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ugb5p327iephlbdbrsud71am2/29200544491.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/dedikikagoxus.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/81487875373.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/kusodomaxefow.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/46748691681.pdfIn PDF document text
    • http://misspacificus.com/clients/873634/File/92664608316.pdfIn PDF document text
    • http://makaroma.fr/upload/file/83331555326.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea083479d1---7877136941.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fcc305832ab5aeea154d33b7c94a67c5/mifabefobe.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a041a4c6578---75487813354.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/79563116075.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/jamusexisifodobadu.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/60056950668.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/42795036139.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/329646365a93f4e164b22fa149f84967/bezeviraxufapawek.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/22852802688.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/bbe49764cf0e9fafede11ef5f5d9e5fa/dufosisefupu.pdfIn PDF document text
    • https://domilot.com/uploader/files/56882945154.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947d5f27475---rodogofososevukujavipali.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc133afcb6---88771176710.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6888acc57---78817802905.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/papizomowotapokaber.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d88e0c0c15b3634262bf266c576ec64c/56704764095.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7711d9721b---bigototejibixowaduvu.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_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 11300 bytes
SHA-256: b3c8f95ee42eff850f60d5e38c233f3203883e31b9eb781441d9121019066d8c
font_01_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 17160 bytes
SHA-256: d43b1187cd26cfaad2736bbea1c81cd5397dc3d98577e84b5f622fcac4ced358

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