Malicious PDF — malware analysis report

Static analysis result for SHA-256 9298db39bb86b13e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 11:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f4085cdc74b9d7bdece1c927525862c SHA-1: 5d24126d58489b6d6ec8620291c53965fbebd955 SHA-256: 9298db39bb86b13ebe4524c3a379325ab17e8e5c81650ad2de8d752ca2883d82
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 CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to download content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://www.findvoters.com/userfiles/file/gajepunamenutaxebitena.pdf In PDF document text
    • http://videlec.be/ressource/file/zuninevuma.pdfIn PDF document text
    • http://heizler.hu/files/file/41946408939.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kpa2p6da54mrlgkeejtnlilth4/tonapowinazijivo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/72397592720.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/17193559441.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/19378855646.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/20458082753.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77614802955.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rupasafowutadu.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/63816170762.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/93116027941.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/xiwirudunejugowixeran.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/85342672120.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6991df4---71097147754.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/sigedugevedif.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4c99ddd7e52fd54c4470a25f28b10f53/76898998653.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/popenajikomujakefivuloko.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/disufunadipaxivowijifir.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/29748386850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=worm+zone+download+pcPDF 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10456 bytes
SHA-256: 948910045fb0f46f76fc7fcd20816dc8ee6db8266d5c3b7d2a2eaf778bb20d8b
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 17832 bytes
SHA-256: c6080fdc8c7d7671531b10b407ce5dc0ce5149827cd123599a4c275733a7a544
font_02_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1