Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0b607c61b2e51…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 16:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8478fbac35c32316dca492b57dd7480d SHA-1: 13247e73794563d1cc0415dd1c62b70a3f45b070 SHA-256: 4be0b607c61b2e514c749d2e89cbb0404faf2d2702f677b756b8a55a16c16071
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The primary function appears to be luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://strategie-online.net/catalogue_dynamique/file/48977605039.pdf In PDF document text
    • https://ddnepal.com/assets/userfiles/files/46087938664.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/lisosedugevekizesoxij.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/wiluki.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/11189170716.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/sitajasewogiroduwowi.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69769046605.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/niwozumadelijekumo.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/31687444490.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed5a83dbf---lovijoxamutogobi.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/56765645739.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/dujibe.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/51594179399.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/12a06998d9ef7f59a502edb7724e1963/64787895886.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibk0dklfu3r5vpbvavkhm963v6/damusuniberokolarolaw.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a183425a41f72eefd15b632d48d68718/1308145800.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/vusegarepejomovuvu.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/69230597025.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba10ad686---golokafebatajofow.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/bigolitifututifeg.pdfIn PDF document text
    • http://tianfonmm.com/d/files/jifozi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/10c51fdd0b8651a81e7e5940600bb356/14126911884.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/91029049457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+the+walking+dead+online+123moviesPDF 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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 17608 bytes
SHA-256: d6b6ea0d8dc3f91f374561d84ca8a161a70b697456d91ccb046604270a4c16a8
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 11300 bytes
SHA-256: 42e8d6902db3917ffec5009da23a3a94e7ff8dc60b066ff6d25082853ab99f74