Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3777639f260d135…

MALICIOUS

PDF

95.4 KB Created: 2021-08-01 20:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10a8bddc09ef7776a71212e98ff765ee SHA-1: 69b384cf6f56fd1cfe9c2cd011c06a6abea520a2 SHA-256: a3777639f260d13512d40c7b3967a1d0894b243950d841bbd90498e6c7af6857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or malware distribution intent. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=how+to+get+toca+boca+world+places+for+free
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987611bc7d6---54619676979.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/130a0bc8b119fccaaffccf6e03a017d8/84833257868.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610608d92332b---zipimo.pdf
    • https://markmont.eu/editor_uploads/system/files/gajijulujo.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9cde590dd83df33de30b0779e26ab4e0/silifusufetugebaz.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakisezokugikusijo.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/322b37031ff2ae2f8f25c1f1e2225a79/25558019968.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d0384eced---kikidivirolikoruxojibas.pdf
    • http://bodegaadrover.com/userfiles//imagenes/bozupojevenumi.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fbf41cf22---meworuzefaxabitudonupakej.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/91ae3d99a63025afbb3aeeebef76f307/mukawifen.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd0b76ce4---kuxubokowamizik.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210527_6204755CBE474D5F.pdf
    • https://edubox.mn/uploads/users/0/files/34596779270.pdf
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/56694933870.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/bq0v8vhgdrcru4i3ham8acuk6f/fenalipajamirineniken.pdf
    • https://baongochoa.com/upload/file/694648779.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066ffb9386---66124446856.pdf
    • http://wanyuantemple.tw/userfiles/file/70313493218.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4097e4f8---88205013854.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/cm52tdt9bm1p01nm9llgghfu05/bebemanasobasutumunemif.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d3c439df---lenuzaxebelowu.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/919a6d7f6742256339ae844f7cd23fc7/31893788830.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67878d1be---sawupelefigujoweze.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_off000111e1.bin
2f5e3666129040f7141e3771451c8cb2c8ca87b727a6d6c92122775979ae8468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10816 bytes
font_01_sfnt_off00012a99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16792 bytes
font_02_sfnt_off000142ab.bin
f7cc204bc1d389b2dd4e94228ade6c0e3ae523aebd961420d256a3a746b3a309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142AB 16824 bytes

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