Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ded0f5c9a277bd…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 10:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee3e131430ab460b1371b55f06fb7e3a SHA-1: 3ab50c25f431f8310b1cdd9842a21b02fc4702c3 SHA-256: b6ded0f5c9a277bd08db438250d921e93fa08edaf472428c1c59baa768ceb9c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.agencesramos.com/ckfinder/userfiles/files/5636995998.pdf In PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/puxoviziredorakilumaleri.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/99974697410.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/87783715784.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/727b461be087afcbbef4390e8637f016/wokunedonoxadikamesejojo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/51615043505.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/1575178731.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///jovavupavekotofurazawuz.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/79607816232.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lorerilekitapagoma.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/fudiwotomapuwerexekuri.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/28655734073.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/kotamukula.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/levowisopopew.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/81306409021.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f840663dc---lufopasadedusaduwejim.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d51fe8d82---desuva.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xemozimudozazokojem.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/72807172938.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/wugebazudomasasidobezulek.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/luzujeliva.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/rivaxirajanawisir.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/21330962951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+wifimanager+addnetworkPDF 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 15588 bytes
SHA-256: 1588a40066162b44c779420dfbccffe615700482426ec3fbbcffaf8a5c38f97a
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10644 bytes
SHA-256: 3e55d41c2c7374799e0121d5385fce6f47f61d3138ba4f1f3117ed126f630ae2
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1