Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f16357fe8fd69b…

MALICIOUS

PDF

71.9 KB Created: 2021-06-18 01:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 19467781e7f454d54b0bd5797b325b3a SHA-1: 1e7416fae337a2b46482716d67b8a05ceffd1381 SHA-256: 97f16357fe8fd69b0847ff4aabb72f52c4aa1dafdb6b92fad1af2b84d593060e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites for phishing or further payload delivery. The primary attack pattern observed is the use of a malicious document as a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=best+gif+birthday+wishes PDF link annotation
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d11d55c5db11288982f5a3d858f13619/80641659491.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/o04a3epl9g849kqa5f2a3vt53b/wejuzezozigozutizekebe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609542abd3159---xovesuredo.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/duxakexu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b647cbe6f73---josuperevenuzesotak.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c441336f796---78231082721.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c88c4ca2---68563701771.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/88703925331.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac69d87311---jurujemuwipegam.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tabsft0ktrj0m95qrtk42iqcir/luwejubogobug.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/a93v339ehjsfasv94hdd0r61iu/81089462915.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q92a3sa1fn0knl086pb1evppn4/41455134292.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/9425916305.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/35748a01424c14a22cdc98b4b3709e18/15272953715.pdfIn PDF document text
    • http://canadanur.com/resimler/files/dadatejogozigapibugeruvid.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/betaminewadixasado.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/1690775905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5520 bytes
SHA-256: 4d0b77f07c60aff4b8e4eafbd145b1110f6f1300ea008dd842fccb88fae1b816
font_01_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10516 bytes
SHA-256: 2e86b717116e9914b18b4703e161d444e030f8c1fa2094ec83e885279bd8ae74