Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f38b77bb542be34…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6802214e6c1c86d00e67dba3b052822 SHA-1: d929c279802127fbcdf7e15d2c32a456fcdd533c SHA-256: 6f38b77bb542be34a84fd26aee2049cbb6ccf98229d4a39f0f712d48fae83877
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=3ds+emulators+android PDF link annotation
    • https://consultemergingmarkets.cubsindia.com/files/27707543018.pdfIn PDF document text
    • http://infoguard.ru/content/file/84724236449.pdfIn PDF document text
    • https://arteziano.ru/ckfinder/userfiles/files/benejelisakewubokibeje.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/sekivafanerizotirulegawem.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9bc1dd7c---29065728156.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/vozemiter.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/videzanerusadufekuvakir.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jofidogek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e4b6fa76---49866463907.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/90092703486.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/69302841715.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/47545555298.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xasufesegemukadabi.pdfIn PDF document text
    • https://renetravel.ro/images/files/fimizan.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fibagobafik.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/96016126072.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/rikeladugovamawa.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/mimujelezukuwanab.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d858542bf---96130451958.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/ferutukuleforego.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/76491703193.pdfIn PDF document text
    • http://yachts-trade.com/files/rewoguj.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/16205808064.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17680f2d0---30609504979.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 14864 bytes
SHA-256: 2d71eefb47e2dbe260a39d4d07e04b79b0c1645954a5f27fd6818cd624cbe57f
font_01_sfnt_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 10584 bytes
SHA-256: 1daae4c2f487431ee2b3b05c1d94d17a4db20a4940a1dd85df8a95af29b06dd3