Malicious PDF — malware analysis report

Static analysis result for SHA-256 016a3bbf30e9194d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 17:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f5c11c50da711b03f9aea3936cd38fbf SHA-1: cbc2358eac108658dd9227aa1d99393e5b036cf0 SHA-256: 016a3bbf30e9194dbae31f7ab7704b4f2acd9c546a1e909ab0401e5af01698ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://disonde.com/filespath/files/20210804020733.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/04f458aa25b0527ad603ca68bb128bca/20275725536.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/66840148968.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/22e2adb9a61260bec62fd2b3b0e7516a/68870351399.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5ad4643b41af518825ed752d8f80b670/37999542627.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/92755975296.pdfIn PDF document text
    • http://futboltotal.net/images/files/bojobi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tccm43qkuklnkjlcgauhoms70/vemomodeliguxapunusoloju.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/18ao15pk3l0gkis3l0qvcq7usu/75878927837.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83ff85221---13373100821.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdf65a8aa---74644992966.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/30264375915.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc86adb4a---82938235608.pdfIn PDF document text
    • http://mega.kz/media/upload/files/88572652058.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/puded.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0a2240877f85809b8bb1ade429f44e68/zudizeduvekam.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89634736857.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/9070339529.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/texupawefax.pdfIn PDF document text
    • http://imi.vc/upload/files/wenajugofanoda.pdfIn PDF document text
    • http://midel.me/userfiles/file/60496114348.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/maburenizemukovamej.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b47c2a9b3016b8c9893ff3c7dc32e5ce/63722157111.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62b6b5ec5bf39326164b5e297c491bff/nodunozumagunufemijojix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=shiva+mahimna+stotram+telugu+pdf+downloadPDF 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_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 11272 bytes
SHA-256: 17fa117b37d0f07c08601a8c5203b20617442200648ee3b495bf2437c9929c8b
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 22160 bytes
SHA-256: d66a6395d4e5e53a44129e149de08ac19bbec077691f91d4f1ac5bab0cc76ef6

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