Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5db16785147dff…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 23:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00c7d304db84465bb4b751dc942811e3 SHA-1: 3f46a71cb1b5f2a636c6f3f6a5f0844a13653204 SHA-256: bc5db16785147dffa55837d514433f562dca3fa9511afd15b43f144ca5a849b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS upload storage. The embedded JavaScript likely facilitates the redirection to external URLs, which are hosted on disposable domains or compromised sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a03ab2341---toduwamakobadam.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bdbcaa41---69850080048.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/96078122937.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d92a869f1aca530f16d029accd48e559/resakusidotogoserise.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/94502074686.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/jafazemomosawukejajevep.pdfIn PDF document text
    • https://umutfm.com/resimler/files/lexozidinixozetogupa.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/54412604831.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/ligofe.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/86292836748.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210918161501.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/83997163567.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/lusamajilawevuket.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb92f0da3---verusapusepovovof.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140027dc4ea5---ludinoxunidesemejate.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/tuporodisogilurutum.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/22059246994.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/55925140809.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/lezafunowaziwu.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906105706300527.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/90613563108.pdfIn PDF document text
    • https://2acontractor.it/images/file/49377127492.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/18856049394.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xolatasevofiziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=digital+marketing+strategy+sample+pdfPDF 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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 16048 bytes
SHA-256: 30d20343b3066f00f3a784b94a0152783a06b313922e4e391be1bd3568fe3928
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10928 bytes
SHA-256: 8928f3a97fc5775a1c0724f950e4fea4dec2794511dfd9957644a70a16c7ea02
font_02_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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