Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c030c5fcdc30b8c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 13:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7544dfaac98dc6d58a82ce5153be949a SHA-1: e79948ae9984e90a0621c6e8c7a6604fef9d1427 SHA-256: 3c030c5fcdc30b8c1f4354d983cc0bde8a21cfd2113e29e72a5ce066afbf6295
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ML classifiers and ClamAV strongly flagging it as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=convert+epub+file+to+pdf PDF link annotation
    • http://eko-inwest.eu/upload/file/tujarowufuzujisiranu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/93057637026.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/90806294157.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/pijanurorewarogexidimobed.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/96571309860.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/50958158013.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d790ef1844---50705636948.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/20366056227.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dimotivebodomux.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/09a6be5efd8c9228b503e2f245426ba0/jitov.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/temabedulesuvuxamisozeped.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31867420308.pdfIn PDF document text
    • https://norservis.info/files/files/13051648185.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c35c7902---kutexiwewadusafazezeko.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307f7270851---87039968069.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zovifewo.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/56808594058.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/moridimidafunuzopogimib.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97133374741.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/lujikuvejeditob.pdfIn PDF document text
    • http://mcutech.net/files/godulaxokidev.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/83565947786.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zulikatidubizopubagupame.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cced319cf0aed6687a89422d16a240d4/maludezo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134177a982ee---batupozawel.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vatevasotanamalevolijem.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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 10500 bytes
SHA-256: 24e4f48be05683e77815049b80b0e6dc3c6988855e0c8095ee58b1b905c37841
font_01_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 17412 bytes
SHA-256: c002a262ccf497255de5bd2acd7ab8a750760940a1a057f1229810d8e67accd7

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