Malicious PDF — malware analysis report

Static analysis result for SHA-256 7231925d6f199167…

MALICIOUS

PDF

77.2 KB Created: 2021-08-10 17:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 983491b7f81bd78b51bff1a197545eb8 SHA-1: da83adef2e6b3fb5db7fb80841541dacbd29293b SHA-256: 7231925d6f199167bc1bebc1c70341b2c1457522a2557cb578b44e31b827b8af
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/50461a02c29c9847d76c7a312d11a70c/guseduzudawoz.pdf In PDF document text
    • https://roc.mn/uploads/files/56101654082.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/xogopowilum.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/82866515510.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/399b8c0e5e4f61d18ea6fa8610d42c6c/zifokokorav.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/80619085046.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd5580ac0---tasox.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61d07f2e2c---konuvafikikiwonerugaxuk.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7df4ebab0---90643045318.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bdd72375ecfdb017d4775934984c52ff/zavaja.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/943592ccfb2a0872202a1d66f9dcaa20/22428805172.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wazunuwet.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/arnlllb79nv9b00p3chl2jl2q1/nuxor.pdfIn PDF document text
    • https://people11people.com/uploads/File/fiwaranijozuritan.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/wotojademapizejodozosewi.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/guvewaxita.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/43349010574.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/68881495119.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/v9to4nlh7kkiigbat4dlncelir/72563141130.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/89741852023.pdfIn PDF document text
    • https://vestol.bg/files/file/15769656771.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1b6adba3f97ed7dc5fd520e53d04d24b/lidenawopusatemidosozego.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707f447eb84---38547604660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=glow+worm+ultracom+30cxi+instructionsPDF 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_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 10880 bytes
SHA-256: 294ff0c7c0557501bbdcd428c2450d256b65450f60428d401d08dcc9c38a784d
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 17468 bytes
SHA-256: 687adfedc096687883aa2c2a0668580c4812458c68d5731e0756f091a652120b