Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c0f811d85711d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 13:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dd56769b02a657181e9f77699468a30 SHA-1: 779e12fb8e7ab4c46931897b8d62638113c9a05d SHA-256: 239c0f811d85711d477a66c53e0b292583594c4b4837755aa0a09c163211888b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm or SEO manipulation tactic. ClamAV identified it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and link farm structure indicate an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cl-metalparts.com/d/files/90653139460.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e25dfbf8---97120969089.pdfIn PDF document text
    • https://brukspec.pl/upload/file/tibofudaxaxunotewo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/befexazexinenimidifabu.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904141905.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/49466111722.pdfIn PDF document text
    • http://usagimatur.com/files/others/nomatinejagusadeto.pdfIn PDF document text
    • http://saimiri.name/upload/file/49619063539.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/dudafulixemowatefekurime.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/17637279099.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe283f402d---55412441874.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/52823598905.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/dozosidero.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/ximugikopuzomiputowibaje.pdfIn PDF document text
    • https://adikmanis.com/contents/files/lumed.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/56130324334.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/70058526181.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912cbc6619---83856144212.pdfIn PDF document text
    • https://rippa.pt/files/file/foxejowirenawuxowepu.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23463530346.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/88393485764.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/dusagadu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d15fgt2ldbujpi00kt0h7nofi6/muxedalemuj.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/19339406369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=robux+card+generatorPDF 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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10624 bytes
SHA-256: b1404179bdda9d669d54e668625f4b3688752bd2bd6a5a836e3a82fea877d5fb
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 18260 bytes
SHA-256: 098fd5dda5d83b2297eb9954f0c09b4c759729aa0b031354904c09e7551f84c0