Malicious PDF — malware analysis report

Static analysis result for SHA-256 938fb1294c8ce9d5…

MALICIOUS

PDF

75.0 KB Created: 2021-06-15 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc26d7fe9f3a6a5b1fe288b09e91f2ca SHA-1: 5ea9d9245e43c375c2ab0ba20debf46b7f699747 SHA-256: 938fb1294c8ce9d52b0c68485c4a133c0b612511c89c4be89b8e63b7d5dcd475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' in one URL indicates SEO manipulation to lure victims. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=brittany+puppies+for+sale+in+nj PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7ca57eac6963b547c60f29bf085b389d/zilojigekojowubebimo.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802eaa95d3---38952123107.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3apnvq3ocgdg250ndt27lf8ue2/zagibitipe.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c2lq7ml27bfr9urhdqdmvm3m3i/vemike.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/559178c8ca14a153b07bf8448d87f12f/jafupuvubokiz.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/61089975444.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fajagaxemedarafiperi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12ea41fa6---8540165066.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/norilebarofapebuwawem.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/44e2a6741be565f4f12c2b7e43845256/muzepugolu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8baba0e329872111d72e3ae03c6fcb2c/26286371873.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/36126629014.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/43839228337.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609015b64d6b7---lomigewifu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286dc7bf14---37197739833.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jhs02qca09vvqkaqpvf3604sl3/jolosoveporepux.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080aafd268b1---migunivipofimej.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0a79870dba7dc69bd7c941213f04af45/35119504503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 5124 bytes
SHA-256: e87d72cc40fd17a4a43d57850b1d9800f8d7781cd134a24f9bdf6f644f27b2bb
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10344 bytes
SHA-256: d166e4862c35964bd9eed43df207a85962707a25e61e0515ae2b0303170d9380