Malicious PDF — malware analysis report

Static analysis result for SHA-256 d447d872b201a3a8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 08:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e376daf2619fd74fd69c006c2b8b669 SHA-1: bfcc761747279192eb587fe06d8eab94ccd3d75a SHA-256: d447d872b201a3a85fde0209e66e28dcb09c9d0fe651e8689e189082c5609f38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or download further malicious content. No scripts were extracted from this sample.

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://crysiq.ru/uplcv?utm_term=quotes+about+being+hidden+in+a+relationship PDF link annotation
    • http://assushop.com/userfiles/assushop.com/file/kogesumiworavigedebed.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/73882653233.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/67122254531.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/texufituzomo.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/31976204658.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/03d8706543a77c8e4eab61ef408fdb4a/newimutewomunan.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/55146423976.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a4557c493d4---sipozujiwevumegiwawive.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/womowapexeruganimutavilel.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9701f515---binevinudipefuv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a567e0965---rilolunaleluzunokomegapo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/da3dc27d6c1575042c440517ec56dd1d/16294147129.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/12887679410.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wuwexi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/35901746277.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/55e02da4536c5a5b6568e74f16d05256/dupamu.pdfIn PDF document text
    • https://service-panev.com/userfiles/jetepatamikalozovepe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b286b49fa11---78435493573.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46d865b8e---888831403.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b44c4ece4---vajepewazisiruk.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e2b2b281edfa53a448cc954724c0e0ff/jixapuxuwonarezejuxobexi.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10972 bytes
SHA-256: d98798b797e07e5d91805a4cd0e0b7a9e7934a7b002f82a59720a5d910ed83af
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 18392 bytes
SHA-256: afc9f521f4e186a412da79812b58eee9e140b26e73d206c9d4e739d7c45ef841

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