Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bf2882aada758a…

MALICIOUS

PDF

83.5 KB Created: 2021-08-22 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3e50282a353a58f91f1c37ca0367e29 SHA-1: 085839766d9bece5de44b3d34bf0eb51e258665f SHA-256: d1bf2882aada758a905cf993930cfa67c1d7937e9f2b3f4e0cbc58a33c175df1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=download+dragon+ball+tenkaichi+tag+team+3+ppsspp PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f5a0258d---33899065918.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zibero.pdfIn PDF document text
    • http://domplus.su/userfiles/files/87953409998.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/71120907407.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/24795544435.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/nupadizudovuxuk.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a1a103ef230f62851de4b87450198738/94546853712.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd17af694---45796868953.pdfIn PDF document text
    • http://packamate.com/userfiles/tegaruginonoleliloxeze.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a092e0ed609---kuzirunawubugu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/babeke.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d3bd9d7f---pumotosudagiboniwejoxuse.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6e047fe17b6ed263974ab7a13990bb46/jizejewinumufe.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6936cc658---255604010.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wivibasenesefeniludupidel.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6786de34205fa598585e23676dffdaa5/71020354611.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/27986939651.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c033c2044d0---pudase.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94847512989.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/zesijajokipeberod.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/nuxiviviwim.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b7feddefcb76ee70e5687d30cbdc8f9b/36443652768.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/jumovak.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 11452 bytes
SHA-256: c4d9e08a82b47ba479147c60b7ac5f90f3779fbed423757f4d7941e782cc3576
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 17228 bytes
SHA-256: a4ce7da70aea7ef92e370f5b09cd7e6c77af463dd3cda30cf014f64c06c0acf3
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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