Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de646b93f0cd5f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 04:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5b4b3593f7628b747b9250172d407898 SHA-1: 896441b4dc72d7b36831ae98d91ba42768574528 SHA-256: 65de646b93f0cd5f775d950b2469f2ada7b370dd8141a5f7252718b01fb2c58d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lombardpruszkow.pl/local/userfiles/file/81001381852.pdf In PDF document text
    • https://zakarpattya-tour.com/upload/kamaxevenorol.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vadawazovufaxuw.pdfIn PDF document text
    • http://kahasat.cz/data/file/97257742843.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/lozumewolilomelubuk.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/dumaxalub.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lokanuxewomusomazifom.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bejugarovu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/dd7ca3f120d228d23fc72fa17243d5b1/53203800654.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/92838132766.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f997b7f99---pitiwuvigixudexuxu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea5fae14e2c344895f576342bb166f14/54521339727.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/lixijurukutimazu.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/60093207606.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/46767592642.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6137F3D929978.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bigitasifumubosa.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/5810280067.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/39251810575.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/66743851542.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/pafimemidurokovudulowuke.pdfIn PDF document text
    • http://nanopena.cz/upload/file/87841099073.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/65100149037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=marathi+font+for+android+phonePDF 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 10376 bytes
SHA-256: 33d1cf98b27ae9c099a66a124ef7cb6ce4d8645caea6cc13cc01eb3c5ee7ce42
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7