Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b9c9a669976246…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 11:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 16cbfe344a6ab112545cab3dd2ebbf8c SHA-1: bd28529c92d3284bec1d5488001e75af1d47b5ae SHA-256: 61b9c9a66997624695e66b5c68784039c5da5940548b3a38b82a536b7f493f06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. The presence of multiple link farm heuristics reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=game+porn+3d+android PDF link annotation
    • https://aradovan.com/userfiles/file/60431126459.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/5620992337.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/zijimuwikajisupi.pdfIn PDF document text
    • http://geasit.it/userfiles/files/ketowuvamiwe.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/77512421300.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6b1e875b3aeee1bd38943a7810e05159/7742140242.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/datagovodozilokixuza.pdfIn PDF document text
    • http://p-energo.ru/content/file/39086166967.pdfIn PDF document text
    • http://yejida.com/userfiles/file/68897035800.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/59989379760.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vqk9g59fs461vmnjlhu9bvnm93/13770157964.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/36778285399.pdfIn PDF document text
    • https://trainova.com/userfiles/file/14594778601.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/nujol.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/lujeporogajef.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/59356521205.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ff10b9d---63651478668.pdfIn PDF document text
    • http://p-energo.ru/content/file/9991886251.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/nezozamotufogexanokiw.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dirapagilipofupas.pdfIn PDF document text
    • https://airbays.com/userfiles/file/8297194103.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_off0000ad7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7C 15004 bytes
SHA-256: 7b2a48b0b83dfd4af8542809dcc0dc15154e26d036e452d2ceee1ad463eeb257
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10452 bytes
SHA-256: e6a54449608558568aab1e08866517ace81e266b1048af080f479d0c66305bc1
font_02_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1