Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb11214eae784bfd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 09:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d7514b5f9d44e61b8392ca034317a86 SHA-1: 3a6ffae5326a445da788f33f0c0b633f2e0f02a9 SHA-256: bb11214eae784bfd2f82b1cac6be81c9deb97d25b47d2f14f6a32e05e22cbfb1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The document body was heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezetidaze.pdf In PDF document text
    • http://ruresept.ru/files/file/jeguzikenuxukejo.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/35137740662.pdfIn PDF document text
    • https://promise-land.com/upload/file/winemutajumitofoxiw.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b664c0528ddc63de272f4179d433355d/kituxidemusabodatapuzu.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/11835985608.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/75e56232b8c36c5d0ff9fded1f19399c/19660090435.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/25178491349.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pusunixagu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/laratejab.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/97660489309.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/81252114536.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5ce7fbaf015bb3e1b72dd57d03c94782/jomovuvedikuzofebegokosab.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e049254a---62627436226.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nidibonuralupi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4060fb45c7b68708d6603848109dceb0/35015738410.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/lokilubetotigogulobosuw.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607832da1084b---sixuwevuwepedajaz.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/digomovab.pdfIn PDF document text
    • http://timebymtm.com/upload/files/poxami.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d43da886---madevaloze.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/wipajogizonubinileketas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fenner+pin+bush+coupling+catalogue+pdfPDF 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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 11116 bytes
SHA-256: 4a01b2c1409f931c5ad2b6d43cf4c1ab8f71f5a3ec7447bd6ede27f6bb10589c
font_01_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 18516 bytes
SHA-256: e368647bb7621d4e2596e652ff5e6b34544f4f6871fe3d493ec182f3fbb3393f
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1