Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f27cd4904832ec3…

MALICIOUS

PDF

95.8 KB Created: 2021-07-02 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abe1929648f631acd7f2e9719304eac4 SHA-1: 5c224d02197db28594cb3144c6674f6a79880012 SHA-256: 7f27cd4904832ec3c5e53b79b4bc1e0f6a5960f0a838dd06c6ce1292e3fad0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external URIs and link farm patterns, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan distribution vehicle. No scripts were extracted, but the presence of multiple compromised CMS upload links and disposable hosting points to a coordinated effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=boy+and+girl+meet+by+the+great+design PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/dhk3qgfcj5r84b02smufnqgf8a/21625667350.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9dbbb99a5---minogomekopexilotazasab.pdfIn PDF document text
    • http://zae.me/datafiles/file/monisabadazoruroju.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4c624f350ed679913a78b64e0b0ba4b9/12079317087.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb8e17f0a0---silifedojizife.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/96528570517.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/novojapigadupijizexexu.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/naletoriviwilesozededama.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/51519079975.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607074741d3b9---91562446521.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/57193490252.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/donagiji.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6tbv11dds9tl5ua5n14t0etrv0/15730245128.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe09776cea---12995490926.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b02de2df4---kegokuwikixukorabefap.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c12d1d19b54ebb9f6f4fc8a6afc6275f/siwor.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09a0a82f0---41162947132.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4dk21bkccqufbop659i3q4rpd4/57001392713.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xusudebila.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cd9e8e66---xofixatibezikix.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a5iiodflju55ajim9gvgla14j9/lasomaw.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a3pqnfbdm0hj03rqkre3nfh9f4/tagivekobateras.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_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 17092 bytes
SHA-256: 9cd36bb0ec03cf08c8730eb3481a4d8a241bbc864d3738aa4cee10da82e3daaa
font_01_sfnt_off000141ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 11004 bytes
SHA-256: 01da81715d7bdb3bdbd2c9e20faeaa27793496f055565dabaa37b5b3d25d646b

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