Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c0394c15a1cd85…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 20:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9655a97f248dbb01b2c371b9ef2be22 SHA-1: dd387112dae91e208714ba30c08d3cb8bc06a88b SHA-256: 36c0394c15a1cd85cc9cfca1d369c0846bcbc95e8029f93bd0449db1a40ea6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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=movies+apk+android
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/84208015106.pdf
    • http://studiovalentini.eu/userfiles/files/wexavigugovibago.pdf
    • https://sonntag-immobilien.lu/userfiles/files/bumexuxur.pdf
    • http://ogcdc.org/uploads/ck_upload/files/71452901513.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/93039710584.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614423046deda---bodaf.pdf
    • http://cdmvt.cz/sites/default/files/38542068414.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/13703784875.pdf
    • http://rucodelniza.ru/userfiles/file/munobelubefetiwisabobuti.pdf
    • http://yacpa.org/yacpafiles/file/28067058751.pdf
    • http://suliaok.com/v15/Upload/file/2021916317352432.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/68601221251.pdf
    • http://claudiamelchior.it/images/file/mokugosiva.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d6fd2e7fecfe90360dd5f3cc9cd79f66/8340619654.pdf
    • http://ndc-group.ru/uploads/files/topegixuwogazu.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/tikugaromizegejosoludor.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/xubokogositoxutitawa.pdf
    • http://kennycojewelry.com/userfiles/files/202109/1630857779.pdf
    • https://boyanbolyarski.com/userfiles/file/15090360592.pdf
    • http://lovesushiscv.com/uploads/files/musekudinujaz.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438cd3aa6f5---buxugexafafewideraxasi.pdf
    • http://lasantitosrestaurant.com/userfiles/file/14924665753.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/72869477986.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 16792 bytes
font_01_sfnt_off0000ee0b.bin
86aa4b0fb99896a82102a0187fb50c58b2767971405adb9efea3c714cc154e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 10392 bytes
font_02_sfnt_off000105b4.bin
af11a18e076398ed6fd682c4f534ce7b7bf8b876037f25847f6abea36609bde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 18464 bytes

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