Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df8926c61575b56…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 19:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0caf19bd9ecaee26af81c6f5b71e7df SHA-1: 8a748c382b6563711bffbc24ee0bd94ab3ec9f5e SHA-256: 2df8926c61575b56ed3cbbe9514d74956abd3379f67cfa081c889cf6c9547894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=how+to+fix+a+bricked+android+phone PDF link annotation
    • http://narcisse.sk/editor_uploads/files/tibibetufem.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69342997645.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bl1kc9opunin82f83j5dklo74u/52505339447.pdfIn PDF document text
    • https://brs.jo/userfiles/files/juropikubili.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/mudug.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede895993a---10913667412.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4d674298e3decc3a08d6bc0fead23f51/95113412993.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/8257394540.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210903_603354F5A326BC77.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/josusoba.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10595522047.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jofesirezukesoletu.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/55813279731.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/881ce5c33bf7bc02a88c3aa3dcdb4182/wazefawiv.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/96164632518.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/55084535000.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/65705187439.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/2773354577.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27510179953.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/kutopinazofesudupawun.pdfIn PDF document text
    • https://insp.biz/img/file/waxogozor.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f261c2204b---zekajedipo.pdfIn PDF document text
    • http://pasaru.com/upload/files/kibakuxamivaxizima.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/64415014209.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/zirusoxu.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_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 10912 bytes
SHA-256: 275d89aae52c74f1aa4c9ae5f6cc027336e3f798fe8ed014256c2ab9257a9b03
font_01_sfnt_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 18684 bytes
SHA-256: df91e2e78e7942f320c3226123ca746e0546107daf4ed79a87d650b9f8b6dca6
font_02_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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