Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c7d2dd7d40a1c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-11 02:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768e227d57fe9e2b12e895eec934a618 SHA-1: 1a378f02cb5bf0a4dc40b71be6b9596b225682c4 SHA-256: a65c7d2dd7d40a1cb538e42c8f464aa3540705e2a862554546d33f50f5b5ec44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=esercizi+di+analisi+logica+per+la+scuola+secondaria
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h46o9f0o8janqaqh700avhdrh0/75144117553.pdf
    • https://watertorens.nl/userfiles/file/93879117935.pdf
    • http://hodinovysoused.cz/upload/file/faloxu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f96aq59c6qhvboj014f6vm7mkq/ronubo.pdf
    • http://keramann.ru/uploads/files/41555513844.pdf
    • http://beiwendq.com//data/attachment/file/41243356882.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744c7bf207---gajukemiboze.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/608f1b7ac2ef3aa641de9b5444c3e750/30967323014.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9ad2d9b9---30250343397.pdf
    • http://petraifevronii.ru/ckfinder/userfiles/files/tijaremegulijutoguj.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/10849093481.pdf
    • http://tpokebar.com/uploads/files/76323296520.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6feb6c6b120cfddceb594d36adade74e/53217131211.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07d3f1127c---78448760731.pdf
    • https://khanikango.in/file/dixobobafi.pdf
    • http://eaas-journal.org/survey/userfiles/files/44097686721.pdf
    • http://winso.tw/userfiles/file/36608378695.pdf
    • https://alixdemassy.fr/userfiles/file/nazomine.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/luzibulapuxir.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/pafumufidowoviju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e429.bin
8d88533135f05beddb3d4ea987220f350a9bbde806f57e7401bc1dc82f59893d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 19932 bytes
font_01_sfnt_off0001180a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 16792 bytes
font_02_sfnt_off00013021.bin
395b420f8c102867559e861a32421774cb0f0f80019efd13f68697602b75e807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 10732 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.