Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13fc34fbe17502c…

MALICIOUS

PDF

100.0 KB Created: 2021-07-17 14:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66b1608ac47047c61bfcd1eebb26e6cb SHA-1: abd3d87f0404303a5c9c119b532ba08dde24bd08 SHA-256: f13fc34fbe17502c78d37f8c1762b836a94897fdc461d48c9e81b0d30ce15ef0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/23a2df9aa2bf0aa1abfaaa154806ef0c/16429621369.pdf
    • http://transsnabstroy.com/userfiles/file/88835100239.pdf
    • https://tiguan-wiki.ru/file/sakotom.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mimd76n5inrhk6ihkhf4mkjk20/pizogulanepevixunuzox.pdf
    • https://larustt.com/upload/ckfinder/files/wisewodej.pdf
    • http://hilimall.ae/uploads/files/sovemomokevawase.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/df796ff683f4e9f8a9d6788deadf5583/41305578939.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37f9f0572---fapovalenedidafejo.pdf
    • http://transfertrolley.cn/d/files/24924823891.pdf
    • https://agermag.ro/mm/file/88698431961.pdf
    • http://geredekombiservisi.com/userfiles/file/94769372191.pdf
    • https://sjalikave.hu/pictures/file/rakilopusakuturosege.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b066c6677---kafosipuzurudev.pdf
    • https://conexkarvan.com/cache/fck_files/file/tumimamelumev.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731fe70c6ff---77151780387.pdf
    • http://curry-box-deluxe.de/userfiles/file/45986623753.pdf
    • http://loadcell.vn/Images_upload/files/48054148335.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608e275b9869e---70298773250.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/84740306235.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/r1o12ip033qv7pvdlq377ekotj/73704075102.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d80b8fd3ed2aa62f04bd7b597bb466e/10744498455.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b760a068a21e6b6f283f9c8b881e73e7/zitij.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/md34l2lt1o3lhda113a2unnp30/3751299689.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c412d9a2300---61872262140.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=galloping+inflation+example
    • 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_off00011fd5.bin
8d17875f88c8efdd49a6e8527c554211365cd8142d232a8ec409fd4fec3267ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 19912 bytes
font_01_sfnt_off000152a7.bin
dd8fa7b99a537002832e7263f56c70be5748dc551bf6cb78f018c50fae7e67d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152A7 10572 bytes
font_02_sfnt_off00016ad7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD7 16792 bytes