Malicious PDF — malware analysis report

Static analysis result for SHA-256 587ba13b31fdefc4…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 775b491b2d08413cf87b366557e24c75 SHA-1: c3924b1f80702f50a715b04876ac6d8214e85b07 SHA-256: 587ba13b31fdefc433b98eb7463be135c9764c17ee2ca94515866ee75c1d3cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://viboot.com/ckfinder/userfiles/files/jonenake.pdf
    • http://matras-devison.ru/upload/file/5803917086.pdf
    • http://shinex-auto.com/userfiles/file/54961470151.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/safewoxejepawak.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427a088ed6---47545904938.pdf
    • https://tauthuy.vn/upload/files/82034797565.pdf
    • http://alpha-cp.com/userfiles/file/fokokelekodajuro.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d353162cd---1474281584.pdf
    • http://sp3siemianowice.pl/userFiles/files/72891119421.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a599165c9d8---11494238843.pdf
    • http://ominocoibaffi.it/userfiles/files/gewosodomowujajaruludufe.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8aa2219c9---13401969529.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b7e5d853800b160bf750b9fb82fccf1/lelus.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/buzeduluboroxipakolovi.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6cj9v2n8532mu8pdoto56otf82/37724646135.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/82633610853.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/95f3c673d401b4b75c907155ab5bf615/baputoderero.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58120ba29f---zapodilidudugefoxok.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944378b1a3a---86222231806.pdf
    • http://www.darvidproperty.com/news/file/fovafibu.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf9f743df5---47749844993.pdf
    • http://krzeptowski.pl/file/dubawozujug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=myopia+article+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_off0000f7ed.bin
34b15e4018b81bca026e07aa776450624bfa23af83f65404b69c975687165ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10448 bytes
font_01_sfnt_off00010fc4.bin
f9038e86d96cd038614949ef204401836a40ca952f97f59111dc4994279eccf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 18716 bytes
font_02_sfnt_off00013fd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 16792 bytes