Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e7b993621cd658…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 10:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b18e09ee605629fd1c837fca921661a SHA-1: d657e1e68e87b90484d186fb3c8b1d491ae842db SHA-256: b5e7b993621cd658cdb3c43990a279f5e6fbdca0ca9cd1c6e6cff6af1c27e0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these compromised sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3f4a13c12653b45005c368aa19f9a7ff/zaxugaxi.pdf In PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/pipulov.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/be74f75f0c4aacdfb7233a731232e04a/netepivawusosowinexivarox.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/94375715203.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beb340017aa---67301286706.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/48940916591.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/zuwevijobi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7e7729f95848afeee7af7002d89ee138/1283046999.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ea8f80112---58658999869.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/89547452197.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2925e6bf3b---lelisupunezakuxuta.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987f505c741---laduferidivijusat.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2f44f3172cdfca0130a97a716691da63/53114335061.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/96350505415.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/86684863944.pdfIn PDF document text
    • http://leguido.net/files/vutunopupeper.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e7af9e7007201f8eecc868057cbec990/livugududavizitumudam.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/winugutiladaka.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/q1frob4uofcjnc1gs8ifn5tcb3/26720492269.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8hofke19ffpht4qnbtuftpalqt/33747409945.pdfIn PDF document text
    • https://activepymes.com/pub/file/67934594710.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6dc946d9---71612106709.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/ferifutibiruvidemagigisa.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/84570888283.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/xetemefogazopawobaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+questions+to+ask+during+an+interviewPDF link annotation
    • 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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 18356 bytes
SHA-256: 6b351e0b66ff493650c17e6c24609739159b0662077e2389253863efe7d93c5a
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 10920 bytes
SHA-256: fabbbd326eea716f6fbba23f4783b03f536611553383830c52f0bec137a07c86

Open this report in the interactive analyzer, or submit your own file for analysis.