Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e069849e49fa982…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 05:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aed33db02d2ec4929821e5b6f545ce34 SHA-1: d249807a4406314f9fe2ac87415d18e7b9f5da2d SHA-256: 1e069849e49fa98279869e2aed45bc26a9832a11ecdbdb45fa9ad8921794ba45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the link farm heuristic and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://nensi.si/upload/file/79489697875.pdf In PDF document text
    • http://status-go.net/gfx/userfiles/files/zosekonalezenixituwagi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613135b0a2ba4---suvevudotapodamaxovusaru.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/13310321143.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/11566508668.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/japukojuzejozexuna.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/wasewagerolerusobokuxagiv.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45612912179.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/dotalakadurumafebefi.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/falasijubaz.pdfIn PDF document text
    • http://logicamail.it/draft/media/zanolilovu.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/62954882699.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/48984120255.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/turerogimoru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150b57c7a66a---jidofenafuzewonesojadose.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/21333951628.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/54136131326.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qu6k8ko26vj35e3c0hd9gurbfu/kabofepekelexiligezomo.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/jobimesariwigajowat.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/82342461812.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/12345086342.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/nemebuxutuleporapakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=maggie+nelson+the+art+of+cruelty+pdfPDF 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_off0000b0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B5 14996 bytes
SHA-256: 562f3b0e6ce074e4a6cee7013733c21afca0e860a1b29f4d28d9b38192ec3a2e
font_01_sfnt_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 11108 bytes
SHA-256: d0677aebf1fe0701631d5f4eb5adb8520edf283ca37f1e6d96c3a5133c382500
font_02_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1