Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d172f76adf6c57…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 04:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f62e7ff27c629288d07aeea9618f1dab SHA-1: 0bacbf521c1b79056ac5f64daa78dfa26f0dc7fa SHA-256: 43d172f76adf6c5792ed222081fd7fcac85076d2c8d380914b0cabd6f10ec1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious further supports this assessment. While no scripts were directly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the nature of the URLs suggest an attempt to leverage SEO for malicious redirection, potentially leading to phishing or malware downloads.

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://ceresasrl.it/userfiles/files/tobepopukeguxokegaze.pdf
    • https://menlopark.com/wysiwygfiles/file/zusotiwituvewafafame.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/72925982118.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613637e3200dd---pakedazigoguvikiruxi.pdf
    • http://studiodugnani.it/userfiles/files/51074443087.pdf
    • http://citranco.com/users/files/tevumudapapekazamurefomuz.pdf
    • http://elmbbq.com/uploads/files/linug.pdf
    • http://autodilygood.cz/files/file/17488740886.pdf
    • http://dj-maily.com/uploads/pages/files/koxegemonifajurupeluz.pdf
    • http://marthomaiticherukole.com/userfiles/file/51864359728.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/92960673959.pdf
    • http://cutskytools.com/d/files/zitapikepavorip.pdf
    • http://verynailscm.com/user_img/file/74401987036.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c002246e51---pimamozedibaki.pdf
    • http://polenes.cl/userfiles/file/36379728223.pdf
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdf
    • http://chixue.com/uploadfile/file/20210913085409.pdf
    • https://radio-clipa.ro/userfiles/file/42544382067.pdf
    • http://refpecsbelvaros.hu/kepek/files/26332447772.pdf
    • http://ctkupavna.ru/upload/file/80368990254.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b26422a442998bfbb3217743b1295aa6/sunumujovorapew.pdf
    • https://univerosg.com/ckfinder/userfiles/files/figomoluni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=javascript+project+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_off0000d85a.bin
256c7e9be9a6eff7cc0cf34594d259c0ab212be41a2b909a0e544a1a1ee032c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 10652 bytes
font_01_sfnt_off0000f0d8.bin
10fa2b3fba3426764abfdce4107067d47596029fca5c8c0d69d7cb54e19b85d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17892 bytes
font_02_sfnt_off00011ed7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16792 bytes