Malicious PDF — malware analysis report

Static analysis result for SHA-256 d085c008042478d5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 09:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05927220759070b459860580be3bf2ea SHA-1: 914c8b1c1276b9f1922263e5e7d9940c617cb83c SHA-256: d085c008042478d56f22ea8053c0f38ea7c303f9eabd6aca563d1fa8f6786278
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tonwen.org/userfiles/file/72967275343.pdf In PDF document text
    • http://rasciindia.com/firetech/ckupload/files/7276173743.pdfIn PDF document text
    • http://orthodoxnews.us/file/bufewovepovanigunur.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/9941519961.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/64102985110.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/56617725307.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kovutirokabe.pdfIn PDF document text
    • http://jsdarvin.com/files/94877388565.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tisadujerifulanenab.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/xipasitefigixebepoke.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/raxeruxonoko.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/pasajamutapimazinunisas.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/vumutajajelugigarufozax.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335e77f30d1---32156271268.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15d609971---mavalapigasoxodo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614602594d2f2---31756335736.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/jifinufoforumewewo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/46421723754.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gabosipenozotari.pdfIn PDF document text
    • http://epicridesnepal.com/files/54060646414.pdfIn PDF document text
    • http://dfanchem.com/upload/files/64314543561.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7a93ef56ff913d0925b147b28e8fe7db/82086253351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=screenshot+on+galaxy+s3+miniPDF link annotation
    • https://mediaget.com/userfiles/files/15385356892.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_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 17708 bytes
SHA-256: d001745a6588ea3073b1a2046ac092407fcff3798633bfc9b0426e64cdf08a08
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 11140 bytes
SHA-256: d72569d4ba4a280cba255daae158fe03d415f70d609f3a66ee2907af98b5b095
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1