Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b927a81c09a6ab…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 23:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3cb37a835e2f24c00fc2b49725e452b7 SHA-1: f45667d327413bf07c445f7fb38627e07e0a086a SHA-256: 33b927a81c09a6ab70ac7f9c3a0b55b5a90e98d1210de8236768fc8d836d6e26
196 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, and exhibits characteristics of a remote-support tool lure. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, likely contains instructions related to remote support tools, aligning with the 'SE_REMOTE_SUPPORT_LURE' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://huntic.ru/uplcv?utm_term=teamviewer+android+mouse+right+click PDF link annotation
    • http://shangrilayunnan.com/ckfinder/userfiles/files/20619204295.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/zojovuxevotali.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/44735848516.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343642ee5b0---52123368006.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/jusojunozuden.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/zagisitubuziduz.pdfIn PDF document text
    • https://coluer.ir/documents/file/81581749407.pdfIn PDF document text
    • http://vodova51-53.cz/files/57328102683.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/biwabure.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/totuworepuxofuxuvaf.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/zaperixuw.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/lurifelituzabeguk.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139550b02a88---59702343206.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/dovetezonugote.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/4676350834.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/voboxevaxoganixera.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/68252093827.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/valedulet.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/roroba.pdfIn PDF document text
    • https://basisnomor.com/contents/files/56903668908.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/zirebubeman.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/56224298539.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161438db48965c---70419905231.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/58038559758.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109182102194597.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 18108 bytes
SHA-256: 26d5fc3c651bb13a95ff6ee6dbc3bcb07e42325a99f6dbe9b6cfddfb4b2938c2
font_01_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 11124 bytes
SHA-256: e70789f5c01af0fb15d8e6637f82e493d41910479689423af6f3e00467a07229
font_02_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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