Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0f5ff67abfc0aa…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 07:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46c0d011c93a5c0ae492450d8157c7a2 SHA-1: 5388aafbadab4b97e4faef90b06a92b541ecba34 SHA-256: 6f0f5ff67abfc0aa46430091327a3ec4451f22d32dd29771695b5301910d5012
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'download button' heuristic further support a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://arisutour.com/ckupload/files/walagibuxaxixibo.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1e92dfe0347f39450ceaaceeaf91a6df/17434140233.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/50343265884.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa666d41f---mavesopowofoditi.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/20371109960.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/pixefukika.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b136e3c4---4776287874.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/72464522980.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_EE32798F4DDAA79E.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/fipuruxexalepof.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/moxiwazot.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/20073642529.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/turagutuxutemegarimase.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/16258382941.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nodijemefobine.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/62644898154.pdfIn PDF document text
    • http://epicridesnepal.com/files/25782008393.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/76212591509.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/60961544502.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/geluwux.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/755192df0472b8578f2803c17b573144/jitewetimuwit.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/jizutoriniwaxew.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/banorezesopebebuzewiruf.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/73987921476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+disable+mms+on+androidPDF 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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 10628 bytes
SHA-256: 392cd659690bb92bd65ce80f7da240e43deb42f6bd0558e9040d57dc7598c26b
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 18144 bytes
SHA-256: 66f7c45f8e5651025ae5298488edd666fb0fdb860b5840fcae8519fd61a5be6a
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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