Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8143379ea5e544…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 07:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 529e80d05eb92636fa547703bbcb5ea4 SHA-1: 97c5256409734ed084be5cfffba2cdcf9b475ba7 SHA-256: 9a8143379ea5e544062e65783cf3618a15603497029aee730b2cc031c0d4bce1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting sites, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be leveraging these links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727491c0850---25569365784.pdf
    • http://iehyun.com/editorupload/file/fafeluwozazojinim.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/guporum.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c224eb9eac7---kezorifejeviwib.pdf
    • http://barcabianca.eu/upload/file/lawojefurolovuguf.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a73723bf360fc07faf51bea049e9fa8b/siwoputikovenino.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/c470db11bc6c1f069615032a516019c4/lizajumesepududojidadere.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8b8bf018---58504839589.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23efc4a05---39446361573.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c56a6aa3b0---98231539063.pdf
    • https://nabsangram.com/userfiles/file/64849393297.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba64b8171---vizikejamujumerag.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb1506593---noderifofesuxedogepijadix.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f59dafda476473f52d1b1ab66b539987/wimonupojuxerudaxapog.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f379b4eb8---babakubifowakunuxew.pdf
    • http://brandiassociati.it/userfiles/file/74816907684.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68b6687a40fce232e8836245aaccc565/leves.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f9be1febb9c36ed11709eaaf73477085/xazujowaso.pdf
    • http://inventory-acepipe.com/images/uploads/files/22510012761.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sof6a2p17pbgbvrs8kl40vf35l/93434403042.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160964770610d0---lopod.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42596d9f8a---runavazekizemum.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/90924519637.pdf
    • https://detectiveoffice.net/userfiles/file/99648573229.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hmojd0tedfm0io4k4u2mvb3cbe/fugukemominujomutis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=past+perfect+simple+exercises+with+answers
    • 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_off0000f068.bin
48ed6f5f6538e99a44c668518abfe28f498e44e0d6e95561a1e9d07a9f9f6712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17824 bytes
font_01_sfnt_off00011f5d.bin
8d15175135ebfb6eb3df89525438c673a36b66bea47ba5c6c684f78359a54cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 10816 bytes
font_02_sfnt_off00013832.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16792 bytes

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