Malicious PDF — malware analysis report

Static analysis result for SHA-256 501124b8d9c455ed…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 15:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0ebb458067b276a21605c5c2952e9cfc SHA-1: 53fee8153bab98d5606ca8a4310bb40a4aab7485 SHA-256: 501124b8d9c455eddf20ef5977a6082c08963dd452d9b8cbb15d437a1ab66395
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. Heuristics indicate it's a phishing or trojan PDF, and ClamAV detection confirms its malicious nature. The presence of multiple compromised CMS upload links and SEO-focused disposable hosting further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://muaah.ca/userfiles/files/bigiwufawamemasat.pdf In PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wepuwodiluxabit.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbf6369bb---47034047295.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbad53d17---girilomawatozijujino.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/fexumelekerejezasigomoxeb.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614061e9644ed---66327424343.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/kisivadexiv.pdfIn PDF document text
    • http://datcat.vn/2018/file/24185721444.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/92434676156.pdfIn PDF document text
    • https://yuktogel.com/contents/files/japifaxirawoj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93ad5a0a4---mifokozewaw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/74f07b337a8f7d707dd9f5c7aefee725/36688771489.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sikabadereniri.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/pepawazukumijutinoleb.pdfIn PDF document text
    • https://wineart.online/userfiles/file/20261025989.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/ditinufabejuxejubexotaz.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/busasokatemaxov.pdfIn PDF document text
    • http://hingliltd.com/userfiles/vijunaludozugazukib.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwukoxezaxetelemamafela.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/tipip.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/69584754712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+download+free+download+phonePDF 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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 15864 bytes
SHA-256: 36b71aa5cc28bac77fd2284cf00f24f6cd344e849bae2e56fc82b2ad428d72e6
font_01_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 10628 bytes
SHA-256: dfc6b3c6b8881cd3f7c468674021850dbc0a567d39686472491ea8075c068cb8

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