Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e66741f18feb74…

MALICIOUS

PDF

93.1 KB Created: 2021-09-06 16:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e331ac98ab198c9065efe1dae68bf8 SHA-1: 682ed98954335ad2a665fe1f221c8b523ab0f8ff SHA-256: d9e66741f18feb744568213375560cf05819e340d644732e88206ed14281f95a
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 pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous unknown URLs and compromised CMS links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/55eed3117a34060c6e32644825118440/42528844578.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/53055d278f56a8422452c37fff43719a/matuzuvagepikurutikis.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262755b8d5---wupabamekepafanotedo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/tevapiwikerigataxu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/36668046125.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/wudulemiralatite.pdfIn PDF document text
    • https://msvadba.ru/files/file/75952525604.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/aceb3ko3c4rqkjfh7riq476cb2/59158459299.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/timonuwuwe.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/fademipipujibesusowexa.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xitotuxisexekeke.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/nagoxemugaveliku.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/90243285980.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/fiwuriwomi.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/mosesutiji.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608295b171c98---gareruselumunozi.pdfIn PDF document text
    • http://htygroup.com/upload/files/51903143629.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/iqjcv5b6s6ee44lu02em13s39a/76102141657.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea10fd65d4---83601812074.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f883f12a---zevilosezedepani.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c04720c82e---67839173863.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9e3c78d7---nafilojokapuzuvolakukepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=theories+of+international+relations+pdf+open+universityPDF 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_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 18744 bytes
SHA-256: 19faa87cd2fd4776cf4446a7c4ea8f0b02fe3d6e68d2a8836ca8c59e6489b979
font_02_sfnt_off00014d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D30 10836 bytes
SHA-256: 43f66ab75a89305ff602d176905d60933388db2761d08e95c1586795528eb2bb

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