Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47f41d342c2eeb7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a26dba0652f8b6f857ca333ccd95fd6 SHA-1: d3f115e1ce42c3307fbf379bf19908de7219088e SHA-256: d47f41d342c2eeb7ec175736c4e6030db8deeaa2a3cfd531cff29f7d74354e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=dragon+color+by+number PDF link annotation
    • http://shahnawazonline.com/uploads/files/88395139562.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/86391798206.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/28315502524.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/24636616810.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bemelotinejis.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/58109750836.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/70c002aeede181e4fc28c5b4fb9f1cbb/4911732975.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/92173433534.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/67539361979.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/kadarenamasupokukupew.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad49952dc9---garenexomalufuminir.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3a90a099ec6c016823ea2b2e40c77a50/pekam.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qa2401jfs0v6eorfl07uc0ei93/bolamumobaduwilusasijifok.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopexapabagakosadig.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/190099957.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314945e77a7---babek.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/65435110197.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/kipemosukam.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7ed6e437a5dcfbd55f3051ffde65231/93324753395.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 10568 bytes
SHA-256: b0985a5c68d0e0a4005dc43f1ff7e8a17996c88ac5e9620ea05773c921115d90
font_02_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 18412 bytes
SHA-256: 67db3b1ddd1cad04e411c574cd0833562ba09d57fc5698356e618e1dc142f42e