Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd11196a23517a2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 21:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d335ddfda728febb81432f9391073487 SHA-1: d71afabdf407f724da7ab46ed9cbf3f870aaf1cb SHA-256: 8bd11196a23517a2dd11a2d12c24cf56038bad8d8a1aa27d4b38fb6eba8bb147
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the extensive use of external links is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=integers+are+rational+numbers PDF link annotation
    • https://trinityautorepairs.com/uploads/files/pabepiniwivama.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af5e452dd294b381a2d82a8b4bc9f8d0/tobawuj.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e83b4e9a2---digigeju.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/72534609095.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/8435422694.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/tosileso.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/winesisitovotonegipiwas.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/fasenazarusogebabejeji.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be5cca02965---pigagodunudini.pdfIn PDF document text
    • http://topp.pl/_topp/file/46559478262.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/modusazu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/55fc90970b7defd10b68eea74b1e51fd/54691124201.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092cd97131f3---kowoxud.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161168d9db2142---67434689321.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff699fd4f---daxopowulo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/g7pakps95hbugq93ep86341ks9/78292933971.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/sexibogixudivukofopa.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pokivuzozafexewewolowelij.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/28515874528.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddee8b5b4f---62563040337.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/37b55846998189915e05c7de3ba0570f/pugukelovoxelenufawa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/708fecc246e63e31bae6b4367118a540/60384227821.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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 20076 bytes
SHA-256: 71df4540e51feb5f331364eb604ab367e10e9780fb158e38b880b97f6aead739
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 10644 bytes
SHA-256: 8d2e9932b71aaee76658b9b60f3facd329089870fed502c63e88d37d242ed99f

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