Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a54029b33d28bf…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 13:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1f2dedbcff9458f34c6d0e59dd4eb4b SHA-1: c226b8d2c9d74bf998f9b82b361b1021ee60d9d3 SHA-256: b9a54029b33d28bf987e1e9c8e85ec5c81fa4dbefef9b35db1ceec3ec9485a00
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, many with 'utm_term' parameters suggesting tracking or phishing lures, strongly indicates an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=supersu+free+root PDF link annotation
    • http://aodaiminhhanh.com/app/webroot/uploads/files/41913117902.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/jebog.pdfIn PDF document text
    • http://texmet.pl/userimages/file/71156579649.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/pajowivejagegalagisesaxa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0aebc11f44b243831a0605f57bb874af/wamufiwazirizodi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/turixedolodozimiza.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf313671---88565423753.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/zobavixuzano.pdfIn PDF document text
    • https://taperagi.com/contents/files/suwilidoxamomuxipemozab.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb05a49b24---kutuvobapezafufibukejinup.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/fixuduwanati.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383f412c03a---20417887712.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210911022622.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64125913855.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/70621045289.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///10308517118.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zabikufefapameda.pdfIn PDF document text
    • https://kede.org/userfiles/file/64184492587.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/99bfaaf51b99bbd9b9245c4d9f92192b/84545112321.pdfIn PDF document text
    • http://dr-temt.ru/images/file/dajudikewu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/radobabibekirofub.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/tanax.pdfIn PDF document text
    • http://htygroup.com/upload/files/pupovimati.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/53141746892.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 10120 bytes
SHA-256: 9cb15ca3cef506fe80ed39a386488baa70a9a9cafcfc949a9456849543d47f6e
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 16948 bytes
SHA-256: 8d3896ce2be28136ccac8e8d78bbaa4c23e799274ae181fe1247f164742d49ed
font_02_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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