Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c59ebf6547b6c8…

MALICIOUS

PDF

82.0 KB Created: 2021-07-02 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97d8c21153288388e98ac5658394a178 SHA-1: 61bc8be50faddb5a7289b50add528b9add64bf1c SHA-256: 54c59ebf6547b6c85a83cb5f38f95fa720a6c5ec66170f5182bc25dbc8977bf5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam context, further supported by the ML classifier and ClamAV detection. No scripts were extracted, but the overall structure and URL patterns strongly suggest an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://stark-tools.ru/images/uploaded/91447421785.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/toxemadusuzenubalonema.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/68d4195c24f948386c954a020de1842f/zelifenu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/38fa7ea5f82daa6c79c85b98b484036b/mewugoduwaxenovaz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c656f23d778---26040294239.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/88547952422.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/nujolulajivorej.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/icdubbvucdpeh1p76bhhu2snt0/gexolupenamuw.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/vusinasotisuruf.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6efrg26ne78p1u0apiioju5nl4/minixidobakuw.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3hboa5510m2gpsstceoba4h3fc/fanaxojuvo.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c718d24---perazapiroroxawebexe.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/51190296023.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/23207420369.pdfIn PDF document text
    • http://goldmustang.ru/files/files/dolaxorogaxujadugol.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a87794a26107293dbe4c6e2cb29b2ad8/53828804487.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/71732861573.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bfb7392285f929a32e9945d33194a850/senupezow.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6491714cdbe67c3d67ba4300dfb12699/sorixunema.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cebcbc9214f25f4aaf6ef205c1e5b864/61117163966.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/60455505043.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2c657a8f---96686270933.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/21851213327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=engaging+english+class+6+solutions+the+questionsPDF 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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 10804 bytes
SHA-256: c281ff7516a4eff6a8e676f9a4961f21918ba5a2b7af0577aa103238ca782fec
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 17416 bytes
SHA-256: 1aaa2ad5105f3fa12c95ba618e8d13921aab0aa8582bbaff298197418feeb0ae
font_02_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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