Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb951c8925e24ba…

MALICIOUS

PDF

128.4 KB Created: 2021-08-01 08:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f366d50d59f0fef87c6dad963d24be56 SHA-1: d1187d8f15b2f2f36066f3e55f13d680ad673435 SHA-256: 3bb951c8925e24bacc472172de44eb885dcabb38948527ce8279822b4a0283a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692a9b02da---venex.pdf In PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/25711877012.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/30812889571.pdfIn PDF document text
    • http://tayles.com/uploaded/89549598604.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7771cf10bda7f6d4b4048750cd461d6/lujil.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3d679cd703c5b00fc57a3419e3759c1/nozamopanodedilarife.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/3931781594.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/34069576359.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/kowamizixakoxopowipe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9643cd053a---vologuduxofopaz.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/pexedigekiwanijisaka.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/87612562661.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/47252145348.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/4121458519.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/068c849bfe6ef3f3814ec80537d1df84/87101513126.pdfIn PDF document text
    • https://ienter.bg/files/51256306862.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/j4nc6o9aghjiu6k5p4s2evkaut/33020929759.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/84016404015.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gfbrnjjsi7iv9j71akjtm7ab93/70582105714.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/7529220838.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba5f04c65---16723424048.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ef48dbcb92e18bdd201a3ca23205424b/34612153969.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7586c39cce---nowep.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f89c7e52101dc7d8c7d77412bb6a7ce/sigedovimezemigofosu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/840651013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+the+characteristics+of+nematodaPDF 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_off000189ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189EE 10688 bytes
SHA-256: b4f894c60b5d7fe23fa0d84847aebefd5da3bc684f2c49f5391bc7fa0be49fc8
font_01_sfnt_off0001a249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A249 21664 bytes
SHA-256: dac3d7f57bf0b7e0afbf4b8f086f9d2bd878b019dd9224cb5fd468005e112d0f
font_02_sfnt_off0001d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1