Malicious PDF — malware analysis report

Static analysis result for SHA-256 2796b405bb8c8792…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 22:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe1d59229ba35a1707479a32927ab01c SHA-1: 3c02f5149b0de3c24141cf8fc4351be960798598 SHA-256: 2796b405bb8c8792974c429edcf40c62e6aae6792d57f2190002042e2f8176a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=toyota+dashboard+symbols+pdf PDF link annotation
    • https://guineaservicesproviders.com/gsp/files/36269632743.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/90729132054.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/nijonazofuvawo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c7d9fff9---97179167552.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/35605387074.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/40067239955.pdfIn PDF document text
    • http://rilta.net/userfiles/files/pipezigowuxiwekenadaduja.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/xowevitunodezukavu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/01d1c8caf103267f678ca7c229ed0c05/42126609611.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zujoromizasitosaxaxuger.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/67528094087.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zugulifivufak.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/datenuwaxunotixilova.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/delopodapineje.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/46251023267.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///vumugovoruge.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101549023705.pdfIn PDF document text
    • http://rockghs1965.com/clients/8/8c/8c68d0bbb6adb8fad5f76254a0516489/File/kutebosowowitupa.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lefagivadeno.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608255751240d---56971970020.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/rolijipevite.pdfIn PDF document text
    • http://chengzechem.com/upload/files/jaxebubenimanijuvufaka.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/33292351804.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 17480 bytes
SHA-256: c330f3bda31a714534cf528bfcdeeb9e2bbb6ed41ab3986d28e28d800b322870
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 10652 bytes
SHA-256: 161600e845e48cb13bc9e0f0dd6c39b175f0e2608eedb0bd45cfe9f5fb3bb7cb
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1