Malicious PDF — malware analysis report

Static analysis result for SHA-256 11432d644b7d8939…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 20:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 248b4a2e62dcca0c7d1ad5c51d676dd3 SHA-1: eb720c3a397e5040ce597ec588b3b9ce0e6fd922 SHA-256: 11432d644b7d8939c6eb452bd8a9d306e51ef24fd9c44fc3477066248d017450
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of multiple PDF link farm heuristics reinforces the conclusion that this document is designed to redirect users to potentially harmful content.

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://tezerwatch.com/file/upload/files/09-05-21-21-17-93.pdf In PDF document text
    • https://marathonlaval.com/userfiles/files/99996012044.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/50621142069.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/nirupupuxovoz.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b58d17df3814bbff9f4752653d1d45e/tutur.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/bisanupusiwomivim.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/53463819894.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/ronesadamasudewasuzebuxaz.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/77919305145.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/57566024243.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/6892542900.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/gapemonupe.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/54550247329.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/99022985042.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/gofifese.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zizanuxut.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b12f1ae0---xuweterigatefasofikadebo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/16130748771.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/woligelufopibaxudosisukod.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/35039953697.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/87474064323.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/117195718.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322db8548ba---nuburenifupuleturimab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ariston+gas+range+oven+manualPDF 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_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 10600 bytes
SHA-256: 32db3747f6f1f0dd75156c5a24574637e791b3f4a57d3d30605b27ddf901e393
font_01_sfnt_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 21412 bytes
SHA-256: 983cbc852b454c6853147cd6e5e04bd529d5122bae6c215ac1dbf14ddaa1ce4e
font_02_sfnt_off000134a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1