Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f97c64214593307…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 13:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd792cea4d26a3d0297b96e19bda3f25 SHA-1: 8245f962adc1fbe9c0c4d6b784670f515c95d330 SHA-256: 0f97c64214593307760fcb4fe196b800bee242f82941e704eccc5bebf8cae328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=obama+speech+pdf+download PDF link annotation
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/bupisoxumabe.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/59376736032.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jf4mgmiahoqt7hqtjeka8jvgk0/kasovidowe.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/23515305629.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfa762f59---xakopefibivaniganolejijox.pdfIn PDF document text
    • http://moristas.com/userfiles/files/13949714366.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/9099507113.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/numijadazotikasuw.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca1d5bfc0899e28c83770733de6b7f93/18857087663.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cad14dca2---sadunedot.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c1e810c798699be8365413ce8fce80f8/1490460387.pdfIn PDF document text
    • http://intergeored.com/upload/File/tijor.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/jokurubogikisurekesofu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6ed26a37---58622860444.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/94008156688.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/junamezororapu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/jurekosokijipazajozisin.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lokodafuzugaf.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/fozarodijaloz.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbffab38ce---lodurosalipox.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fc8d3b3234cb908188ac8a6dc0a1a8fe/zobejonoxolojiburipozefun.pdfIn PDF document text
    • http://www.pilartangguh.com/file/nifanabezaxizilabet.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087473461e02---rilefumaliweninavugo.pdfIn PDF document text
    • 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_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 10844 bytes
SHA-256: fb566a2f6c464c0df4871d070f8fd111573c8a4cb81535f80449854fc4df1dd7
font_01_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 16844 bytes
SHA-256: f4794285ae1ec9020430bd68a1304a1d37367f4ebc809aae8e13cc3330f04e1b

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