Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b0aa92b95c5fce…

MALICIOUS

PDF

121.7 KB Created: 2021-06-25 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7787d933f124bc9a07a726d82c6446d5 SHA-1: 20b05e3be3d865fe5da586186a6d59e4ae871761 SHA-256: 29b0aa92b95c5fce0589011282ffc86ae3be93e62d1250c70bf0de41b82fbc83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kimwendelldesign.com/ckfinder/userfiles/files/63045691341.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ksocu0g1mte9bmteelv96kfj3p/6243824786.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16074d34813f7d---37492277604.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/78562571291.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b78f8b1494744046635808479c5d7685/judupepit.pdf
    • http://pogotowienaukowe.com/Upload/file/94084051842.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/177c0710657e91b883e0ea30cc68c629/muxobewetedotasetifojilip.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lsgcb9i8dm5v40orsb8bkoi716/75675864736.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a473ce24b---90557780601.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec2602b0b8---57871504225.pdf
    • http://ac-kenigsberg.ru/files/file/29627826545.pdf
    • http://ciarajewellery.com/editor_upload/file/37181204399.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607580551a53c---25276959425.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a0acafe4a8b---xivini.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/04982d91bc06427699fb66d31e9fda14/74225157188.pdf
    • https://alexandrapanayotou.com/web/images/static/file/93324891018.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/etfcdf06jmee6ndppfm865nhn5/68210932780.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=solution+manual+of+introduction+to+electrodynamics+by+griffith
    • 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_off000168a6.bin
98b0b583501ea8b57e30b76eb3e6e25b14476eacd0354b6b6232feb8494bf5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168A6 11352 bytes
font_01_sfnt_off000182fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x182FB 16792 bytes
font_02_sfnt_off00019b0d.bin
1c099f4ff87ad9fdad8adba0e42aaae0ba48604a370828b3444dfd6badcfe4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B0D 23076 bytes

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