Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9e466d5523ef83…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 19:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89c8d2843d07868ed4db8e9bc97045d3 SHA-1: 744d12ce28b866e61252b048cc51362412e82fae SHA-256: cf9e466d5523ef830768699c87a85bdc2dd203833c8a483f10676699e73db34a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73bebbf52---39199647362.pdf In PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a988c944bd5---pejodajejejedavuju.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107efd17c666---96631484529.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/ganugukasakonikakenotinun.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/23927843071.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/tabilup.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kizalogulega.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc98193dbcb---lolurotugizutaseloda.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nodezikalogewujogaman.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/8792252939.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/74595116665.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/mufemofupegapiro.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d89d8fbe---72686608326.pdfIn PDF document text
    • http://midel.me/userfiles/file/riruxibubew.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/94198808909.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/7867254627.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/70882830374.pdfIn PDF document text
    • http://dgjst.com/upfile/file/26915766528.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/77389877495.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/19090791740.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc632f2fe8---53710770114.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a9d113ff0d254dbd04031c5cce287970/16129146496.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/14244014761.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076737bd9a45---dozidokavibaz.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/89418048326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=an+introduction+to+semantics+and+pragmatics+pdfPDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 18704 bytes
SHA-256: e9cc8358d7723413e3d683b6695f14bd584dc5f868c33907de21b108e54ffc88
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 11000 bytes
SHA-256: f7d22f7abf70cb05ccd03da423073b527631c3d99da625475602b6bf138656de

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