Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b66f8a64b532bd…

MALICIOUS

PDF

99.5 KB Created: 2021-07-17 19:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4e76b97367c18e762c056c294fa42e2c SHA-1: bd7989e6cd5a3e0275bd0c456f90777856901693 SHA-256: 37b66f8a64b532bd1b94b23836295eea12acff87f3084e5ac4c56f16d62ffe9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. One link points directly to an IP address, indicating a potential attempt to bypass domain-based defenses. The presence of these links suggests the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/8s54sfa0aqod9jar6c27798nur/36533604005.pdf In PDF document text
    • http://intergeored.com/upload/File/mogezanepoworufixebuk.pdfIn PDF document text
    • http://metallpress.ru/files/pozolatepogame.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s6h8kdeholmsouk60a67jeppc6/govaxumefegiwisalabadiwu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc2ee0b8d81e411cb70a3972382189f2/46225936501.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/90516832876.pdfIn PDF document text
    • http://moristas.com/userfiles/files/13949714366.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xumibo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e869a6fd6b---57369048486.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ethpc4kttkhjv0vmk4r7kcbnc7/22400052143.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t8k403v54p636lhui2r6p7j2b0/simupobimuwisuwilegawar.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde9677371---26934410343.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a06078e68---78661435126.pdfPDF link annotation
    • http://greenplanetnepal.com/userfiles/file/85125691634.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2977244004---wipufezafemimatolu.pdfIn PDF document text
    • https://network-italia.it/file/67329723120.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/50eog0ag2bnotdah1u68agl8j5/86283575080.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/kukotapuloloveka.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bcf1e4d52c71601f8b25223eaabb0cbf/fopopobakopuvigojexuj.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4o84lg9t5tnilmbt20gtne60r7/13404158573.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/puwigepotelijezuwi.pdfIn PDF document text
    • http://screen.by/images/file/97325186241.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5d0a354c---kogira.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9af80ba3---belazi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00869ec8---mixitusemukovizevaxukagit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=signs+of+tourette%27s+in+12+year+oldPDF 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_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 11024 bytes
SHA-256: 022180d61f2c1453c41577a1cf93ada892f223dd04069e699adb4f3773ed77ec
font_01_sfnt_off0001370e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F20 19156 bytes
SHA-256: 39c6a7e2959a938340f8fa72260b87467cd8448845242c583d7b97c5f8305085

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