Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb6450bce9aeb3d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 12:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35fb1e261d748f236cabee4ccabc25f6 SHA-1: 917408e255e79b83744fe88f52d1bfb36fa44854 SHA-256: 1fb6450bce9aeb3d9cb835ef5a6feb66b99dd88e05eadb063c2e1e77a430b505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=online+convert+mp4+to+mp3+audio PDF link annotation
    • http://sage-chem.com/image/files/20210906_141224.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/81976257352.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72771042079.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109072023502916.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/89706255450.pdfIn PDF document text
    • https://olterus.info/contents/files/suresetaralixenevuzare.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ofkdtud6h7etufh7g1oik0sin7/87845274302.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wuxifajovipamuvimi.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/58532841671.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66545703613.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba01e9054---43998186049.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/84373798216.pdfIn PDF document text
    • http://villkasz.hu/editor_up/19565115470.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/viteraki.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kezarowatomu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3de96cdc2a63ced7cb31a480bc195cc3/zelamado.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/29074947270.pdfIn PDF document text
    • http://abnicum.com/files/file/mirakumejodipugebawil.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/43112349875.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/vimubonakal.pdfIn PDF document text
    • http://blgjad.com/upload/files/kizig.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/68172427271.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc25c9e7f---goxemebunetunomekamesexuw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613491ee7a571---jawovorifedilulaforamilo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/lazuboworarodiwakusix.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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 17404 bytes
SHA-256: 7c52076cfc3e436070ce2a54b0ce9f951bcb107e8ee52f7c8da119865b9aebf7
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10948 bytes
SHA-256: 092f055f6db74be1ac8224de8ccc2c3ee5b89c2643d1f51ee5af048b13a8af14

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