Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e51482cb6bcc47…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 22:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31d4288c5e9c8d8ae3bc33328e47fd6 SHA-1: 77e27b0777007625c9e62da6ea4a4914e86a1115 SHA-256: 63e51482cb6bcc47a8b497dffb8e2c0595cd85031870ada134154876b9c8b006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, some of which appear to be compromised WordPress upload storage or disposable hosting. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://synerhu.ru/uplcv?utm_term=friendly+words+that+start+with+n
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85500237617.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6b1351e4240607b7cd030633b3c38418/53685364729.pdf
    • https://jnnjhansi.com/userfiles/file/gusazete.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/62900455876.pdf
    • http://eatatrudy.com/uploads/files/17338055507.pdf
    • http://leebyunghun.kr/new/upload/board/files/30154983648.pdf
    • http://spain-ex.com/images/blog/file/41130528445.pdf
    • http://fanta-life.com/userfiles/file/48239354086.pdf
    • http://e-district.org/userfiles/file/rumiborapi.pdf
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/peserikano.pdf
    • http://hbaoge.com/upload/files/21007316221.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa02016b7e---vusenova.pdf
    • http://lavalnerina.it/userfiles/file/41128549757.pdf
    • https://hsiaoying.com/userfiles/file/73670145621.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/75115307749.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163088600919.pdf
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/rerepirovukanamig.pdf
    • https://alhasooncorp.com/Files/files/zezakosetovosiwefapu.pdf
    • http://youil.org/userData/board/file/16038945152.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40e67f7a9---posukodowopizoledurifu.pdf
    • http://madonnina.info/userfiles/files/gurejonizezagal.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/gizeja.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_off0000d4d8.bin
78318e9a7725132d2309e7f4d80ea97d5a39c9052bbe6fad917d9bb2a95a603d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10524 bytes
font_01_sfnt_off0000ecc7.bin
1cae0e01eb29ecac22be4e5cedcc86405e7f5795a313eb52704cd2297adb0b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 17276 bytes
font_02_sfnt_off00011990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 16792 bytes

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