Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9b0e3a086e2593…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 02:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff31339fbf3635857d5560b8a3713d2d SHA-1: 13192778ec40cc59bd1a9b4ce057f21ef618e28e SHA-256: be9b0e3a086e2593770ecbfe39fc1d08345a6e6325b53453fa303664211700b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links pointing to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=hornbill+textbook+in+english+for+class+11 PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2ea9a9e4---24125467789.pdfIn PDF document text
    • http://k1a.ru/images/files/file/miduzomuxinuruzako.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/25om026cn1rfb3ai92c9ffdam0/gikukogepajewagatav.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f9f0d41b747fd42c90a4ff821e4c2d2e/suzopagupefax.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/63943672622.pdfIn PDF document text
    • http://mesterek.net/tmp/gufidajorokerolov.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/liwadozokiruwudugisumegab.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/13fbc9b08d32ebe3855cff84a6145e0c/44201565768.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/nesikanelofoxig.pdfIn PDF document text
    • https://vestol.bg/files/file/98650812801.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa51034fb4---viweve.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d4cb1713726bccf5c7ec0e6f8d8cd917/ketulak.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/wilujalifade.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16125ef0289a40---28906033550.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/nolomekagelupokese.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/e3vecq26k0m683p16qp2h7f9k9kvk6fi/74403909932.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210728141322.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kutag.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/63025112401.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d40ebaed385---tixaxeromizigatugeluke.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/1807712057.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/64c0267a6ef2b2822cedb47f68cc6b22/lajaroxarakuvibadeduw.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/83552411360.pdfIn PDF document text
    • http://standardamulet.com/files/files/39307303369.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_off00010a0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A0A 17976 bytes
SHA-256: 6bbd3f61a1f99d9a9d71b23477fae6f318c139dc0aa5d5e3a81094957d363f3a
font_00_sfnt_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 18456 bytes
SHA-256: 87b798ed97baf0582f4c1e72a347dcffb525ebc0ce6d3f84652274bf2f0ea625
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 10992 bytes
SHA-256: c99891441dbae04eaa761fb1bba16b9991542b00c7a6d2af7078a39d5d8a5542

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