Malicious PDF — malware analysis report

Static analysis result for SHA-256 923d839810faf2fd…

MALICIOUS

PDF

76.5 KB Created: 2021-06-13 20:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150f4a8700f4e75e4bf22cc5b9c80768 SHA-1: 7255f249612bd24f9aec36b5b678ea7c3baf6847 SHA-256: 923d839810faf2fde5c47e1c0cf3a4610910ed906ebb52dedf8cb3e30e6ecfb7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=sad+status+download+video
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b311bc36393---79915979243.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ab0b9a120634b7be0b6ce361900224d/gotabo.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/27a6a5df731b47cda513c5b3e6cc7f78/26638799343.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ae56c569cdfc3ba456147caa8a5f1ef7/53387360520.pdf
    • https://digicpictures.com/downloads/xabokurinifilazobawosuf.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f4d42d4e471bca60029bdd7f02edc429/rezamojikizijevukowu.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e0de0b1a---53466199833.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609086fdc5d57---60451313815.pdf
    • http://mulroyenvironmental.ie/userfiles/file/99760855501.pdf
    • http://urgentcarepb.net/userfiles/file/738427002.pdf
    • http://phuocthuan.vn/images/pic/file/kabarenigezixevumoge.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fad5b50fa384f19b4553bb6991533def/18049549958.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21967b4b59---vizoguwe.pdf
    • https://k-newsletter.com/ckupload/files/nefimeruliwagiluvuvorodi.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/fusenonavepiri.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608186aa0ea30---98056336764.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e299.bin
d474f9bd4b1824afb9ca5fa3d695d467ed211a04dbaa49f772bf061f27af7527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 4860 bytes
font_01_sfnt_off0000f339.bin
8ce7fb1b74a66c404f483655a1f0674beebfe8e4592783e3a7b426b2ea2416cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF339 10444 bytes
font_02_sfnt_off000116e2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 4324 bytes

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