Malicious PDF — malware analysis report

Static analysis result for SHA-256 065b854cdbc0718f…

MALICIOUS

PDF

102.0 KB Created: 2021-09-04 13:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e739bc6069c48587f165e6698c2c88d SHA-1: bb153f2f660c77b36f51635bebf8240ddaabb271 SHA-256: 065b854cdbc0718feecc2ed96f6a07245a34e71c58e31017ef732b6b06e9c433
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to external malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and URI heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=le+droit+international+des+droits+de+l%27homme+pdf PDF link annotation
    • http://huimao.com/upload/roneravodesusosipadi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/02214523abbc43452f3aa8c9ba76c86a/85590323438.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/baronizuwomora.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/basesugutimo.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/65347216437.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8960885d64---nekexepabimugukil.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/86373505014.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/fagudoxalavinatixog.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/valutov.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dosigalafofelobeliluziru.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/dalag.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gigedotizupelasawunumab.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/fajaxemabakajasuvuvake.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5an21djdicp2hfjhdpk27jbtj4/vetesona.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c8ac64ba---nuzabekemixewatuduje.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084054abd469---1842052013.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f68c6d99---58098151741.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/13091168760f183fd3a9aa.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4435e12d768cca4f14de45cb996257dd/majedozefukigo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160878447570ac---12171356823.pdfPDF link annotation
    • http://tpokebar.com/uploads/files/gotefunobigav.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6kd07u9si3j9ajf0s6k94hioqq/wonave.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4f40b21f---13658812563.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_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 10756 bytes
SHA-256: f6430e6f39968f90403646d45d93ee06ba395b815b796858c7b4471204c786a6
font_02_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 21576 bytes
SHA-256: f5a89457570890feee74b8f87094adad1f06e375ea8ba92438a7a9346eb85493

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