Malicious PDF — malware analysis report

Static analysis result for SHA-256 b354088e3e5e70f4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 02:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb5df768ca566d2c9e749d9b38ac4b15 SHA-1: ec78d6ff9c0ed4d5199a53f3b750c47aab9ff4e5 SHA-256: b354088e3e5e70f4f6a13eb2d78a61b82605993bba137adf40877339d37d2811
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are characteristic of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=android+get+screen+brightness+programmatically PDF link annotation
    • http://domexpo.ru/up/file/28303653098.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/54159790105.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/lememiwilidexufu.pdfIn PDF document text
    • http://grafitym.kz/files/file/85988432573.pdfIn PDF document text
    • http://popmetre.com/news/files/25634525112.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/34190788059.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614050b46109a---46605241541.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/29272d8653b1be11bd50aecc7167473e/94851555116.pdfIn PDF document text
    • http://compsult.net/userfiles/file/81698896115.pdfIn PDF document text
    • https://websbag.com/uploads/files/29180281093.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb29b1afa---najoxemanikexuwirona.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/42925343644.pdfIn PDF document text
    • http://ndt-ultratech.com/files/sofajokuzukuruno.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/riwigibigereporij.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65665a8d8---savopakeligar.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/49858525119.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/23393328950.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/74935597772.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/65514968813.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613ad58cf3ea6.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/22544254718.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/rovevuxulinawisewuwari.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/8507499472.pdfIn 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://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_off0000bcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 17128 bytes
SHA-256: bf6c278b742222befc0204ec43d68c1edf15418304de41ae697d93483b1e6292
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11196 bytes
SHA-256: e28a9fdef713b28e479f1e485b6ae14811db15f8975b9c7f11fe5379ea4ea59f