Malicious PDF — malware analysis report

Static analysis result for SHA-256 718d3bd9765d8b19…

MALICIOUS

PDF

83.3 KB Created: 2021-06-25 16:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d89e1b6ae3f5ec994e380f5770fd4d SHA-1: 7ed5d5cbcad903b5c90e94895ffcbac986de810c SHA-256: 718d3bd9765d8b19d6c4212276ecfbddc60e93cbebde53ad356849eb4654ea4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests it functions as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde8c3a0f9---lipusulizunovevob.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/569fa2805200414e9af2e0b81773eab8/71538179770.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70ad98f2fa8aad4425197d4d0d0bae43/30680818604.pdf
    • http://scro.ru/pic/file/50786588843.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6431a7f6---48889454716.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e61bca323---45475250409.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/49c022a54e5e6c45cafadd97c4a4fa12/87750526070.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0f35efebb327426933a74380a9132b53/54083241017.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vkme4eedbmi4lasvtvfr6bihbb/fimekador.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1b48105a---63519457436.pdf
    • http://thermcom.cz/userfiles/file/69592094869.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76ba4b6bc---takejofubi.pdf
    • https://brianhigbielaw.com/UserFiles/file/15434236829.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/17937502966.pdf
    • http://shannonlakeestates.org/fck_images/file/sezebetijaxiguzobapenosig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mp4+instagram+free+download
    • 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_off0000e388.bin
7dae6f913c0cb5a313c8ac1bd72a6e9901db87d45fa80ef166f13bcf02c5a956		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10996 bytes
font_01_sfnt_off0000fcfa.bin
87e249043b1b95057c159e1da2f905a3674ef94a3edcb247c56e49f737b8d56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 16884 bytes
font_02_sfnt_off000128e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes

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