Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ef3dc9911b439d…

MALICIOUS

PDF

107.1 KB Created: 2021-06-28 14:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bd378d710319d6a4c4c617a6610cfbc SHA-1: 1351665b156fc9eedeefa4ab257b4d1f3602ba41 SHA-256: c4ef3dc9911b439dbdb8ebea9d4d05db6b959588f9935105b23209c4e8bb405e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/gj5hu3o689r9sjj27913ddvcl2/jexuzuna.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/47d7d5a3479e27745372894f40c8c7ca/jafon.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/37496903528.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502143757_1173471844.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee637e0f416b93d4098ea537a3246864/6018929687.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/51aad6a348d06d3feec3b158f9ec90a7/54882605236.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3b47d545e420b31a1b0288b901604678/74075412013.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/beu3em9a9s3bg63etmeatsq070/5685314800.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d2917efd9cbfa7ad7c74dd22f1436d5d/zisarageponorupazanulide.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607540eea913e---dologofaduni.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fd5dfe92d2f6c4328883b6a4b0c29db5/4203487996.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c945e80b2---godexaxidozibalanaxawonap.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/f86ub49ik5fmghr7ib6d4jo25b/kuzunikawefaradanefikev.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/72868077583.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g4tpacjj654hvdj022f92c3ac5/93208113899.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67ba65e35e9354f246ff6b21fb82aa8f/woduxelebiliwizenes.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/16177519729.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/67b58a246deec7c442b4b52b3cd4c36c/jelevavetepepipetewopeze.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/salumuxegavawe.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5f8a700a---kojipuniwidirabuwanuf.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/30384728422.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af263fb0---92697990960.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/jebisevufovifatalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=funny+insults+for+short+peoplePDF 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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10484 bytes
SHA-256: 8f4f7495a757b0e27fb8c5286d3be42567f546dc5ab4e5c58e8a1298b3760a22
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 17616 bytes
SHA-256: 5d926b7e99fdaad40b1dc47579bf44f84952783a1f3b8268b16e9d4261996874
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 27636 bytes
SHA-256: c9cd77758499de25a4e4d244df3a60d60044d581875b0c9828318caf625a89fb
font_03_sfnt_off000186d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.