Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b01d88196254998…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48a8a7fed24f8d2189f8eec494f4be8d SHA-1: 83c479f926a5f9ac39ecf5498e55821834d8b4b9 SHA-256: 9b01d88196254998f7bee2737a8c55c4de37da587239eaba39b71ebf4358688c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://smidgel.ru/uplcv?utm_term=kamasutra+book+free+pdf+download+in+english PDF link annotation
    • http://dichvuhangngay.vn/uploads/image/files/66027511986.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/kaweb.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/vizexamawobepe.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/92048252555.pdfIn PDF document text
    • https://efnnma.org/files/file/metakepimuzeponakawaxaj.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/luzatijoxemex.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t5kn71irlen75jqsq2vvp9k7ud/zogogefogofed.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xezimi.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kafobef.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/bumipotigudevumuxosigi.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/bofomixikapofakovani.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/25103158163.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/5976371175.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/49960699078.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/melizekugola.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/35699023994.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/339122bb64b9f8acb5f706c0e038ac06/nadiremofeta.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/viguxisatelibix.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/58586744910.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145812e3ba0b---92842444445.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e646744e---61275277210.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5d0e03a1---sofirovawururusedonivoso.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/sitisonofugitep.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/16142490936.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e52463983---77373713057.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CC7 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 23976 bytes
SHA-256: 1b58db4a4619ef31f769362d7fbda79976c59023deddbdfcdf0afd8f0cb1ea1c
font_03_sfnt_off000142b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B8 11356 bytes
SHA-256: 041dab6cfabef7d4085f262ec3e65c370b0a2c6157c613565304d9b260a931ea

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