Malicious PDF — malware analysis report

Static analysis result for SHA-256 8172cabcabba7b35…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 10:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88d8b71357ba0bba11aa7dcee8d1db55 SHA-1: 9445fc3aa532ba1d989f731d9ab16d56d3a8d9e3 SHA-256: 8172cabcabba7b35caeb1e861347cdb6aa3ebfdb560665948d9e921ae1125e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://wastran.ru/uplcv?utm_term=d+day+android PDF link annotation
    • http://monticellotownship.org/userfiles/file/lugikujalunab.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9f9b8769118946cf2d1f064d44daf8d/xabuveguxogopinufe.pdfIn PDF document text
    • http://getem.pl/files/file/dadabubonunofezidefupuf.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630587750.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/61247689910.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/54731578511.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614021771667e---10349826158.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/12284348427.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/tonamuluzufivevuxesuw.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210914160230.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/47103019772.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cbd597669daab2ab6b3f2c7a209f7787/40047547821.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/tixikalabofadidemedut.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/kokobekajirowegopepopunu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kewafolej.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95c092e43---10330100418.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/47826496411.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/posarakusezukofe.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/mowukuxaxexu.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/zulidakurek.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fovugenufixumafuboji.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5fb7ed52eaf10d3d3a96d8fb9e739df3/ladatijoludexu.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/zetugakuvolowogapev.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/61507809284.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nelodigakid.pdfIn PDF document text
    • https://windsbs.biz/files/file/66263154911.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 9912 bytes
SHA-256: 8342ec0f7c9ac5947a4c39144b726242db68bd3dea891eb83b950fe72b3591ae
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 18164 bytes
SHA-256: c5ac8471ba8c59b075bf1e682137c3edffa2f102f87c3524055068b1dd70cc4d
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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