Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e0d7613905df82…

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 13:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc8a8ee9899c0524a9e79a9b2b9244d2 SHA-1: 255b32815c9257169e52a46b5ee12b6cfbfcae7b SHA-256: 21e0d7613905df82cefbaeddde02de3230a1fe169bb7036e4c903e9692ce9c27
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The file's structure and content indicate it's designed to exploit users by directing them to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=endodontics+problem+solving+in+clinical+practice+pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f1829549f57a0eb824e741bc53400242/94896296010.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c9d94d3a---2139041560.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c363c0a917a---fejavevanupisatoko.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zamowilizuvepe.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a0f83732---nulev.pdf
    • http://ciskmv.com/css/file/sonuwivuj.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc7f9c907c---pajevagodokugoworusebe.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/4578ee0fa02b7f56be1181b347ec06a4/rulez.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160895ddc905fc---febokuzurologamimeje.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/75063985567.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b65648e7597---vufomewuxaxibo.pdf
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/zadilabi.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/202a28dacdfae7f617bffc211d626dab/43416624957.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2650549869d50ee052469dfac089b44f/62000976453.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08f75c6a8---taxex.pdf
    • https://faktxeber.ru/resimler/files/satunemapa.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_off0000d5bd.bin
a6774760ece3836bcef4d5a5d8b6d2c8cb4060ff0f41b99b1a37a3bcacd573de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 18124 bytes
font_01_sfnt_off00010531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 16792 bytes
font_02_sfnt_off00011d48.bin
3e4e7d132a38c5bacc45d7d4e3939e988f0d6016ed6613c90e73a9c542183892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 11152 bytes

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