Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14d1cb1f50236ae…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 05:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53fa9674d71f53371ef21a1bddab6a06 SHA-1: 516d23478838c15125621d72600c842695cc5077 SHA-256: f14d1cb1f50236aea4bc01ea86ebaed2a15de131c7e68fde31ce406c314c81a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous embedded URLs. Heuristics indicate it's a link farm hosted on disposable or compromised domains, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=best+free+launcher+without+ads
    • http://eis-pieschel.de/UserFiles/File/94247123168.pdf
    • http://xaydunglenguyen.vn/upload/files/42e093.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/suzopoluvutipezixabowise.pdf
    • http://slsnn.ru/content/files/tiremexu.pdf
    • https://ratoempat.com/contents/files/zogatukopowugaruwumenub.pdf
    • https://condominiovillage.com/userfiles/file/19016210812.pdf
    • http://vietcem.vn/public/default/ckeditor/files/wafamekamed.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/aa3d606a3ffce6f0042ceedda946371c/3628320944.pdf
    • http://career-id.org/ckfinder/userfiles/files/22556117014.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ebe7b72e---60347864131.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6r7g0mli8oj0u4hv4geboti7q6/jimofiwuxukar.pdf
    • http://alotercuman.com/ckfinder/userfiles/files/sofigidulira.pdf
    • https://tcremich.lu/files/files/74695804570.pdf
    • http://meble-tk.pl/userfiles/file/90570525073.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e984d1b0---gafogonuvu.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/45705854554.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5d92fbe3---tevuxukupirerikix.pdf
    • http://aaas.handyfriendship.com/upload/files/75438254781.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/76253550864.pdf
    • http://wisdomtours.net/upload/file/52456250315.pdf
    • https://magicdiscoradio.hu/userfiles/file/sixewid.pdf
    • http://madmojo.com/fckupload/file/52788402673.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0ea2f3e1---21331392023.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD58 16792 bytes
font_01_sfnt_off0000c56a.bin
b471f25c5868acd548b9c4d7555d5583a4c0cdd30eeb523f0f8aa13f94ba5156
pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 14420 bytes
font_02_sfnt_off0000e95e.bin
2d04e3d8ad2d7443c8410c126fa2989821e524eebc4c23b6aa1b8bb62a532fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10812 bytes