Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fa84d196809a6d…

MALICIOUS

PDF

87.5 KB Created: 2021-10-06 00:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 547e9594b8dee2c67059fc82b5f58169 SHA-1: 2a3277e2671b0db6ee6b88bc0a1495c7ed9b9326 SHA-256: 41fa84d196809a6dc4eb2864cd848ba185527392b9380e8378a4e78e1523d186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of redirecting users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=velocity+of+sound+is+largest+in+which+medium PDF link annotation
    • http://h-p-n.fr/catalogue_dynamique/file/soruvadovalebudifesabe.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/35273527108.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/68306355854.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/batilisitofugawapanalixav.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/raviva.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/gegajiwivefirilamuvugotem.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7de94a49b98a2d98baf30fd638b5f6d5/vigulubabaru.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/povojinevukexorezolirigaf.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/692b9950925f5a7bd87a62cc4fcafaa6/sapepipuwuti.pdfIn PDF document text
    • http://pileki.com/imgup/file/3389654567.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fadijoteworuvadulin.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/68488504120.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/86770173163.pdfIn PDF document text
    • http://tencanpowder.com/d/files/23666995027.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/99401243517.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac62bf372b---25626333768.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/97510041954.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/4545760238.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/11320291789.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/61677560906.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210903042102.pdfIn PDF document text
    • https://kaparatt.com/images/File/4526907023.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/70252297729.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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 19572 bytes
SHA-256: b536ab15bb4b1a4786afd822fa7f9f2152d9b2e99c39778b3df8159d6d5988c7
font_01_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 11192 bytes
SHA-256: 1eb7d4bf348fee9c8646636f428571b7889e8c5893751220684893f9b5fe6c47