Malicious PDF — malware analysis report

Static analysis result for SHA-256 334b596f729cbcf5…

MALICIOUS

PDF

94.1 KB Created: 2021-07-23 06:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb14f9169168cb3d0d31bd5fd83f7dc6 SHA-1: ed3dfb0106554fb21a39fb43252f04ad7c9ff725 SHA-256: 334b596f729cbcf5a6982b8a40381475f0ca38f1b0c5a81823643c84865ef767
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mauspro.net/upload/files/50997611348.pdf In PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/cm4hr7u6a3909042bts9hamfj5/96065360256.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a442ced0e66---54745759264.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/pizizagororoj.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pijuwaxarozogusojediwa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd7b8035e---wakemoludufokebolasima.pdfIn PDF document text
    • http://fnb-concepts.com/images/uploads/files/92717066487.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f02beba70---52478865498.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/44398681068.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/fajodejuwujegegubuw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b522002ccd8---linikikurabidi.pdfIn PDF document text
    • https://kildevangen.dk/files/59104629352.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/livozakanuxotunama.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9b53fb79---19198972815.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/64928660475.pdfIn PDF document text
    • https://dpmceramiche.it/file/vavula.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/24f1e4d0a3268c990d48eec86c243d35/19856963873.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/j8030an28fn06no1cpl92il721/mipipumuz.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/jawopawoxidesegivizixe.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/73903227435.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4693f9ffab---dawafulivewelejawowejubi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jivakejinesilanaxawe.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/zabanegawokiwolo.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/naveniviv.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5a792ce---natelag.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47dcb178c0---93892217169.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/98108561530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blond+front+hairPDF 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_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 17308 bytes
SHA-256: bf988b4cb628b94508bfee8443f94e99657f5c89723521bdd46f706508a568ac
font_01_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 10204 bytes
SHA-256: 748e0850d2868b6fe5f51cad9ad5720887320c8cc0574baa2f67fbbd58b19a47
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F91 17324 bytes
SHA-256: dbbde6fd1248bb411a33befb5b336e0cfd5bb85e8d429a56c24b2296b2daefdb

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