Malicious PDF — malware analysis report

Static analysis result for SHA-256 2685b1cac41ea1ff…

MALICIOUS

PDF

119.4 KB Created: 2021-06-30 07:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 74c7abb3c4a3d7c254468a1c277aa3aa SHA-1: 5752e6ace87f359c259c82c403625be6a87aeddc SHA-256: 2685b1cac41ea1ff8e5e55088d6119b86854a7e3f01ecb018f223b12a0deedf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content, likely involving a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a3fd9f0962bf6772242ec981a4e1f0b7/fisalitelojetujum.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3905e5ff---48137579830.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/fevozapunude.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vaxotanolapudabugog.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6424b4a636---19560191801.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb6abc9dc---duzuwulimonubonat.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e4d6e3d2---92695661817.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4bb99e768589aa12a9b20b75d269b9df/8648889095.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0e8mhbnngnledp7q66jvu1bj6a/9022019160.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f1ad303f---91414676118.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/96d48659298087fdd1b467c0fa2c7aa1/nizeripokivufixe.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/bh78lt0b0uhlg0c9fo274pgqlv/xosupop.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9ac4a5554ba6a4fade120338a8074050/tukapalazuv.pdfIn PDF document text
    • http://jump360.co/upload/files/20210625124444.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/bc7e1bdb58e26b94d66ce14b6842ebef/5968539450.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/815a63ef4ae5ee59a01cc87e9122066b/92687510214.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be2ff3b032---79229984113.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/fexovawusam.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/55628632144.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077698dcf6e3---70054962654.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6m4r9sdsb3a9iuh91lcgfbdhrfcllnrk/87382144454.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2199f13c---zekatinem.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/bd68b95e475d42a10e9c29cea6977a6d/sagas.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ee1b41c0df2fe69d1900566f116e7301/fonogugisutabebafebemo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092793e77a04---wazedopilovazomuwabov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dissociation+and+solvationPDF 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_off00016eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEB 10196 bytes
SHA-256: e3dfb6e3c32c7db96531a2a939020f23877bc0d9efe78cb8d73e9bc90dfabba8
font_01_sfnt_off000185ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFC 19004 bytes
SHA-256: 13b2a01ad4c57725bb464d3dc2fcc2853caca9b45b5775525f1aca132ec6644e