Malicious PDF — malware analysis report

Static analysis result for SHA-256 341fc9918283af6e…

MALICIOUS

PDF

85.3 KB Created: 2021-08-20 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50952c59e4af1fd24fc69df4c1eacecc SHA-1: 11d55373ca1a432cf3c9ce63e9cc650dc3863ddf SHA-256: 341fc9918283af6eb7283ea153828ccd227b4b76a98f1a1c84d5e7cd40c1fc66
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these compromised sites. The document body is unreadable, but the heuristics and URLs clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://animationcoach.com/userfiles/file/nigobijezozexitavubasat.pdf In PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/xobesowurazix.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/61928711559.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/viwid.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/betegojememufez.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/2365927689.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626497037.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/pewogegevixiriretode.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/49767166152.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/140547070531fe4b473f3a567661f87a/90733623816.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30107170649.pdfIn PDF document text
    • http://cocoal.com/uploads/file/fusawekofobumal.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add6df6cc62---sepojilekajudemujopagibex.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6698756245---73702741621.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807be01ebb6---24228466884.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/27094347406.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5119ea33a---55445524113.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/najuzemarizipasidewunowu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/86k7u4ihu9moeftnrkdqurvq9h/19426085722.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f823c396e306d5d9697fc46e34375f56/94205539993.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/ledubizigezebobutiwow.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/93672257372.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0obdoppevlao492jh9btujls13/31239147042.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbecf8dd94---34787750757.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/14410262891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=misumi+spring+catalogue+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 11056 bytes
SHA-256: d83f497b105cc1df7e2c9009684278a636cd39640924733207f0a7d2fe94691b
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 18016 bytes
SHA-256: a5184025b8e0bd465cfa61a593b0565da9b6cc35c892a0f72dd88f899b651b12
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 1864 bytes
SHA-256: 2a14b4132a43780e57566ad24a0c24d2a7b9cacb46dae84ee426a0b92cdafbf2

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