Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfef406b319add6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2432a25e29d6d8f3cd4f86bc38fd39df SHA-1: e9de1733bd940b612bfad19e9bcf8a04cc764c54 SHA-256: fbfef406b319add6b6f5c911d8e0b72ef6c844ca79169c9484dca75bcdc40e04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this, indicating the document's primary function is to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=paracetamol+hepatotoxicity+pdf PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a74009c---36152326591.pdfIn PDF document text
    • http://ned.ru/uploads/files/warugekazetepine.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c739fb913b---pizofiti.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/jiwabexatili.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/48444496353.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zapetusuverajopekine.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/7718774878.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/92342241541.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/tepemogijamafesexaxobiris.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/27372536812.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/44838257240.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jojuvevusagewusovivow.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cefe2d15ee7---bunubebaxemorijobe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc78981b49---pazaladezumudoroma.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/20769794364.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/nolamifija.pdfIn PDF document text
    • http://waterreducer.cn/d/files/20963740885.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf6d1514a---wuligunabob.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///18163275803.pdfIn PDF document text
    • https://noddy.nu/images/file/59685898699.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c010bcdda77---majukoperejixomexuzino.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/totapetudogudibibeso.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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10832 bytes
SHA-256: 26ff4a26ce52391ca9443ae5c5b431385550c38c457d3d645b5eed550a7bc10c
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 18860 bytes
SHA-256: d72492caf3c9ce68f35a5275eb550b541fb257a8f469a383627eb906c37f63a3

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