Malicious PDF — malware analysis report

Static analysis result for SHA-256 809a7fbd0032ffd8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 09:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b6e046de9612a5957fbc7fc2f46d2d9 SHA-1: 39ca50d923c90a69fcca19ce0bb5342f465f1ff8 SHA-256: 809a7fbd0032ffd8e26cd7d9be6b343384a08871cd3e618ca8a3a43975239cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fu511no2v7bisblm37seebpuqb/24744359230.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f6a1bdf1---fatexebudizapon.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/lazumozusir.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/sugabowawojakupowawig.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/61637046110.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/73601181379.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bc7e0d088444e3b7b4f39c6552bdacf9/nijogofolizuzomebopa.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078990242271---vutibevepikuzuxupokowanu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41788987e3---farobesexidedexak.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/zoragovufodilokimuz.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xexizimulupotizew.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/69740541918.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/68254317904.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bfb0200e---84997864528.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jtv158a4hle6r0o3cf3j9p85ep/64815862308.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/doluw.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774fa88bb53---gedozusodojudo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a2c7f65ef3bb3753b78e1819a10e0217/likizelidamedibekef.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/32257590384.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/gapumubedidudejuk.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/zofujutetajunasebip.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/40532564109.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c1d6170b2---18619589708.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/weranuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wisconsin+card+sorting+test+manual+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 16136 bytes
SHA-256: 25941ccb3f7f1a0d4e4601606c73eded13255b387b339fcfc628bca024bfed3f
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 10996 bytes
SHA-256: ae393dc6e255b9d72a2f1bc8553c14811b881692bf63e73e432d3c84a89f9583
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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