Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4628acfcd45792c…

MALICIOUS

PDF

87.3 KB Created: 2021-08-29 15:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c087deebe7e95be427bc1ac4df89a09 SHA-1: f2c6cf6bca2de975afe2bb0099162d1fbfb0d951 SHA-256: e4628acfcd45792c136a8c24475a9b233f5fd0a76f9c286be5c35e1cf8006370
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The PDF's structure and embedded links indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16110647478169---98011748185.pdf In PDF document text
    • https://hamasataccessories.com/userfiles/files/fuzeronu.pdfIn PDF document text
    • https://mauspro.net/upload/files/netalufuvabud.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/782876969.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/45629512510.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zuzerusopudegegavi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161273bfc9e34e---muzajetikexuvasafumapazox.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082285ad0089---palulugozuka.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/lepopogakajemakowobo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c720a143c6c---jesemege.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/ripop.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/15656468755.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210721_E2A44FF6A31D832B.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jovop6f1mudrjoqb74scrmscb4/3543154443.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fitodaxokifuzawamur.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/66983896631.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/bukowesoduwu.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/78123970619.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/89fea4310e8eef830c8e340bd4204908/barabemamotux.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/85420960771.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121067f49490---xunuseritatuvifejopapi.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/92590568209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=soccer+games+unblocked+at+schoolPDF 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_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 11132 bytes
SHA-256: dc98ff3c6a23fa7474907d8aaa62fc2ad9453ca44b6c2aef12582125a9b281df
font_02_sfnt_off000121d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 17616 bytes
SHA-256: 3b7dfe5ed2fbedf47a78a7e93058e953c4e190b4e9817b3a727fc85025616bde

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