Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b9c58c2ace9817…

MALICIOUS

PDF

106.5 KB Created: 2021-08-11 06:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3da42c886e372dd177c6cee099b5e59e SHA-1: 80b90e27ad2c66dcef829e7a9501a3da0b7d9130 SHA-256: 56b9c58c2ace98174a9cc2c94d90f43ea98a72625a7514a6f548056c84307463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9634

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c071cdec---firifemilaguwovenobazivat.pdf
    • http://munsusa.org/userfiles/file/20210629000240.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f820e078ab---kudegiwezino.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609496516f68d---tasewovofavolop.pdf
    • http://edelstar-mos.ru/files/74149861660.pdf
    • https://greenfins-thailand.org/uploads/file/65511292718.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jik8csqa5k264k5q7me281ogc0/koterumisafar.pdf
    • http://reicar.dk/userfiles/file/39436554221.pdf
    • http://caratow.eu/userfiles/file/runimun.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c389cadc498---12663271509.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6a5e54d8---64225819847.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/92090978046.pdf
    • https://ludifrance.fr/userfiles/file/54777923400.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fbcf54cec---lexaxiwaj.pdf
    • https://vntdc.com/upload/fck/file/99581750538.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/39494137815.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/doretelas.pdf
    • http://interiorconsignments.com/media/file/fuzarububegevijabij.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d7d12b965b5e3c045f137cc079f3387b/kobijiteradididi.pdf
    • https://luyenthitoeic.info/userfiles/file/kisupabipopuga.pdf
    • https://numen-wow.com/userfiles/cloud//files/98030519989.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8562cef2223a9f4fdf0c59d42201b9bb/tifokem.pdf
    • http://alt-1c.ru/userfiles/file/wokunawov.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/rinarufevewev.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/ruxoxodigiwepifol.pdf
    • http://abwingsmd.com/uploads/files/19160218255.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qtpkng7agsdj3t894evinfbpmv/jematijezafoku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=need+for+speed+hot+pursuit+mods+ps3
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001122d.bin
c27e7a459b0c6b6f51a2909460e7b648a049cdc15f3c1e91a0489de947435b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 2988 bytes
font_01_sfnt_off00011e75.bin
401a6bfe53a0ec9118d87a3a5734171b365833ea0b5b27a4ae6f5d0bab18a07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16884 bytes
font_02_sfnt_off000136de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes
font_03_sfnt_off00014ef5.bin
28e7e219e0fa8aa39a5384b1ea0e7c8f65c6d0613e925b6efd6cd6c0b4c9652d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF5 10700 bytes
font_04_sfnt_off0001678f.bin
3f2ab17bc0674f507f073440490b82c4c647c6925f62d14acb072927c8c2c8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1678F 19576 bytes

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