Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c11199dbe9b119b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 14:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e992c0d8ebdcf79f677bfad50a02102f SHA-1: 15a7e4c027281405642d576b91631e00ae47bd1b SHA-256: 0c11199dbe9b119bbb164f2fbabb90ce2a515e9cac63f434edc92dc180d31c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to lead users to download further malicious content or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=find+the+value+of+x+in+the+following+triangle PDF link annotation
    • http://trinitysportsandleisure.ie/userfiles/file/gudurupupasagup.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/natufa.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/95964898120.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/kamuxoxosuwek.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/lijugoganeter.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/nonujowole.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4edd56fa8b88057f296336d1d5937876/jubunaxobofazikidujuxor.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/7880582943.pdfIn PDF document text
    • https://panoramabyty.cz/content/76466994862.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/rodifivivasovad.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/10322070307.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61360F3E6C53E.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dt7ngd0h7ogibkp102gg9nu9ad/padabimosobevarub.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedonaropidetu.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vuvakiruponutunekadax.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/visutajuruxabominiramejo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a666dcb669---wolufidipurofoze.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109080814187796.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/tevimuvozezorivapewiwuju.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/12148858508.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/76310745218.pdfIn PDF document text
    • https://ijpdua.com/contents/files/80693486401.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/rizarepabozubig.pdfIn PDF document text
    • http://topp.pl/_topp/file/loropanixunulufusenubo.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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 18068 bytes
SHA-256: 80b7348912b7b3b63b8d677627145caaa2f9343ef2f3ffed5b3029e552815490
font_01_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 10796 bytes
SHA-256: 664761f52ff7556afc8a93b99165ea8369c2fb03577f0b16b6414e712717d268

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