Malicious PDF — malware analysis report

Static analysis result for SHA-256 3608593871f7fafd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 02:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fff7643b48c1874f2bdb636115b9c4ad SHA-1: bb70ecd4efbaac9ee2ca3f1bbdf6229109a4fc8e SHA-256: 3608593871f7fafd9ed0804223bc082107aa7f4d49a438e17e0280ec7329aee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are associated with compromised CMS uploads. The primary function appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=pengertian+daftar+pustaka+pdf
    • https://palezieux.com/ckfinder/userfiles/files/vezuvebavipetowub.pdf
    • https://crmsaas.dswip.com/ci/userfiles/files/jukuwize.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///meranuxiporodunejerad.pdf
    • https://limpiezasinasel.com/userfiles/files/730171077.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8854c9d20d6bd82536b6511758163f1d/48085405057.pdf
    • http://p-itos.net/admin/userfile/image/file/vujawenikonevame.pdf
    • http://dobrasekacka.cz/userfiles/file/92789076164.pdf
    • http://innovatepc.com/userfiles/file/maxujoweferidolaviw.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b02da27b---japovafukenikozek.pdf
    • http://capitaldanceacademy.com/userfiles/files/94297595056.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/24721389760.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16119d40554b82---gadetovefuvoretarogu.pdf
    • http://andlupa.com/userfiles/file/72739692968.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580b25545e---12707467970.pdf
    • http://murielbellhomes.com/userfiles/files/32950674094.pdf
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/wuxozusitulujilunu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf575adeed---58407608982.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_56164F82B7FDCD3D.pdf
    • http://olguanaokulu.com/upload/file/fefukafegopeje.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/kezarutogipusogeju.pdf
    • http://a-swiss.com/upload/userfiles/file/59168536029.pdf
    • http://alibabashipping.com/userfiles/file/71112884852.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161194875c1575---firedizumalabupivagi.pdf
    • https://red-adlay.com/upload/files/32027746443.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/bisovam.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d382.bin
4a08a273911ddc7ebbf915a8a6da5b5d80c6edef2973b48b250dbba48dca9810
pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 10700 bytes
font_01_sfnt_off0000ec06.bin
bd447e3c23e76277a1bef6307c780f1b4155b3b9e12e4ddc65b730860c648952
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 17448 bytes
font_02_sfnt_off0001191c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes