Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8f2476b297940a…

MALICIOUS

PDF

150.3 KB Created: 2021-07-03 01:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8625aebb38941c56e87d6feec182537f SHA-1: 96262b41730874c2353f050211c6a93baed24f99 SHA-256: be8f2476b297940aa6aacd3f95663615120b0d182c70b4739b9e944fff090f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=belling+the+cat+questions+and+answers
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d68d36f14bbb4bfa997925267679d800/xupewagaromesize.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df917197370---bipuviru.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/74cc050636e3a1d2e10c187e368dcbae/69420754272.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0rmc4uk6h0aphaenc51s4675a4/nopabezowon.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8ac48037---39565183573.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c41eea3b---6845175216.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608144f40223d---gatawolexurokidovafuvide.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9384c28248---zowipolazotagidemalo.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-7-1/20210701203450195708.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6f54fb14---lumaxajefuwuxavazuse.pdf
    • http://www.urbanwaterways.info/files/73751579932.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eac7bb69---34850183419.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kedeluxofinu.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/rchrbf7decuqe6drngpnjqhmfi/43455714767.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/80770172095.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d479c16398---mevoxamobis.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/qoo5kr17isupuhu5glilonfsupunq4bl/pokudusadaketope.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675e61e957---90890849541.pdf
    • http://fw-simple.com/uploads/files/jenarubazulalaj.pdf
    • http://hoshitorionline.com/uploads/files/57752221998.pdf
    • https://baxsporthorses.com/userfiles/file/lesufoxaxujemu.pdf
    • https://oversaslogistica.it/file/dulimekozokorobu.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8ea18ed16---taramigero.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa381d3cf2---jegex.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_off0001ebce.bin
2b70a8a8f6eae77359aafc4cc27ea2e37fe264168901ab58d37c9922c7fcfe0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBCE 17688 bytes
font_01_sfnt_off00021a1e.bin
e4beb990f7be79bfca45c358df9b9ab680bddd186910870ec8d3c62716cc9d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21A1E 11032 bytes
font_02_sfnt_off0002334b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2334B 16792 bytes

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