Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efee7eb401b6cd2…

MALICIOUS

PDF

83.2 KB Created: 2021-08-03 18:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 974cd13250c1b138df06d48c9e25223b SHA-1: ba810e0af0e3b3fb789a5b971539928f83547af6 SHA-256: 8efee7eb401b6cd287957b2c18da0d9ed8b5c1b6f6effefc7b735ed704a2c3fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://area5srl.it/file/pisuduxadopu.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/25618098341.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/59067378625.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/102694b92c99dcd18c7faddb4cb97674/17474997644.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8d81aef1659527f681effafaf15f1ce8/fivuziwitesapekiviz.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/jinewasagidonopajexuvoduz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609240b249016---mufaweb.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/gajakerugesa.pdfIn PDF document text
    • http://yilip.net/userData/board/file/76953520084.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tupijolironukupif.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160962747245a6---80618985510.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/u7gcat9pkor6d8o6eg4nccru30/97259874611.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/lobebigisunenazogebezateb.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/todajabunokolafikifup.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/nifetug.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/34489195997.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/cec462a3eb51270ff25327faf07fd218/1935614893.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/78834172123.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/wiluxaxerurimupezil.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e3f3d750---89547418668.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/78330777877.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/94113068596.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/40015449189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=does+directv+have+phone+and+internet+servicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10632 bytes
SHA-256: 2a45050772362795f2f8305f74e7bbabcf90ed507271a02347f514143cd7639a
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 17636 bytes
SHA-256: 2f7ed706364835a2d3f54be71dcc99124598dde43c988d25a496f442f55d1623
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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