Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab38f3d84282c56…

MALICIOUS

PDF

97.4 KB Created: 2021-08-21 23:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e71661fcc5c9048e7e0e5a6e5f1afbb SHA-1: 30506007e39ba321c53ec9d78c085f956a1720e8 SHA-256: fab38f3d84282c560808146a44f178b5a95f90aad8b7a214940481f885d786a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a pattern of non-clustered links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://leinerpakgelatine.com/survey/userfiles/files/61778095149.pdf In PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rlvngjlktgram1gj9a1c07kp96/lomiri.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/35128230961.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a337c0486a4---91953021824.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbea194e9---zafutuzabutobebeberujif.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4989f89b49---lexavixobob.pdfIn PDF document text
    • http://dothi.info/images/files/kudedodobozajovizezobata.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fed460b557894fbb809de7732431af2a/juwuj.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490b146505---72861091123.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6f161ae2---mofiwewivesadiximo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c051fa263f4---kafovuxog.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/33704898222.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f883c7c467b7afb4ba1e7083ed3d32fb/wutin.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/55092993627.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wubamowubewebitopabazo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/99f6c28faf9e39813ed0fa1dd5936731/1434343842.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac09cd5c240---75247842847.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf4c4d58d8---90870668662.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/visaturedifofarubizu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03dcda8cfb---36560863044.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbc15cd8dd---3080231361.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/fiwokuteganevufejev.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/93b7b317e63fef9e9be7690e2c68f7e3/vibudugobikopum.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/715f1754d86338bd5321a2b2b4c7356d/28442548198.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9e5d3656b89dada054b59bb816b69dce/47092297271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=halimbawa+ng+abstrak+sa+kwalitatibongPDF 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_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 18164 bytes
SHA-256: 165ee1299180903742a52b73012785bbcd7bb67a72651954b3017c5662a141eb
font_01_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 10628 bytes
SHA-256: c4c8c2be6fcfccda49897cc1f64899aef13d7cb4bd56b081160548e3d205aa93
font_02_sfnt_off00015cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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