Malicious PDF — malware analysis report

Static analysis result for SHA-256 0731a7983131e284…

MALICIOUS

PDF

85.8 KB Created: 2021-08-23 13:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43fd87100a8c52392e09c6a1288972e9 SHA-1: 618881533e66ab0812789deedb9d282d4d49ea84 SHA-256: 0731a7983131e284e6ea11411f02da3f245e8d5294cccd71450cb1f3f32294d9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tiklatakip.com/calisma2/files/uploads/ginik.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e1db8792d8d74d513ea157471b63390c/89638134051.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/tobixaxupu.pdfIn PDF document text
    • http://asustainable.com/global/file/58182570367.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8d42a9953c558d6926520d3b4fc22cbc/64307980295.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/wivis.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jnr9cjkpqka2agtp3bcf25l6n2/wiravinitanegibaxizabefew.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/527c649ae94506269bfdaff9094558bd/88569533017.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/jomudepedemajinus.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f222e3febc6e99e20ff74616cf80fd9d/53528073288.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/konidudonuxen.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/nikobatexetowexozo.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/13396543763.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/10438057683.pdfIn PDF document text
    • http://spiregene.com/image/files/20210709_173817.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e9389a883523fd3c058c3f50510ba48e/wubap.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cb0f786b4---dujafobilozebuta.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/tuxaluwap.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/86575888090.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/87788067693.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c11d3da9b08782278f11ab62ec350ed3.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fuzupojinemojujuxafalula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+keep+goats+warm+in+cold+weatherPDF 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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 16816 bytes
SHA-256: 032a0e8732f77dfaab649356837ff673a440b255238c44881459b86783ac99e6
font_01_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 11132 bytes
SHA-256: 76b7eaad917dd582a768570238fcddc321036753b1b1fcb2b21f9114dd53963f
font_02_sfnt_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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