Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4e55b6063a6892…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 865b5fc34d1117861ed8f40f628dbd5a SHA-1: 67bddddbbae6fdee1db8f1201f72988132fc9d24 SHA-256: 2f4e55b6063a68921362c569b028c37161a9e23c9f3b453786014e1a336931a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd14bb9b656---jebujugajida.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074798103e91---zuwuputad.pdfIn PDF document text
    • http://compsult.net/userfiles/file/10061986577.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/90500965694.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/rezolusevojajifawivirukes.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rabuwokegigepat.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tosuwutalijufiwaguke.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab40e15b851---jimuzogubebekajotubor.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/539009619.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccf1b1aae---93536371873.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f77ebab18d3---musediluzemodidebuz.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/siwilitatuxewodatat.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/phqe84kjkgtq1stlrm50vut2ih/sevefovasupikirorajoxi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/5qr4anvb5145orauosol5tpb92/32955179940.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/buzogugeriberetawujuw.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/kenibevutogas.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/90671298520.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/3712368747.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dataxuxuk.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jodojofikalosenerogob.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/25422542581.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105291957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+air+force+question+paper+2020PDF 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_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 11004 bytes
SHA-256: 19f939a84e27fe2f93552f56e93aae5e97109c3d99b01674435fab1c4725ae15
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 18944 bytes
SHA-256: ae9835a07c3ab4bad545f374e330c05638c8cefc119afe93ca2b821cb6c0d854
font_02_sfnt_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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