Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf9d320f850f47e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 17:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fdad745730d41ca5c2104244a1fd344 SHA-1: d7108e2d4031cc3a529c2f486f3792cf0dc533e7 SHA-256: 6bf9d320f850f47e1bb6497a1e4c1696aac53b32a0cfed4776a8fde24908832a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a likely phishing or malware distribution scheme. The document body is unreadable, but the heuristics strongly suggest the PDF's purpose is to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdf In PDF document text
    • http://www.fonfe.com/uploads/files/fesezozorawabujat.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/kivewefozekafukulefimodel.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/69093865ea237d68fc0cbb08472c6901/benok.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eef764ced---68418290521.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/zaduzipetalizepizut.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/t3a1mn07eepjiepfc8n5f0h6h0/43639321212.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7b9e63ac6---31612602552.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/puxasolosoxezobawu.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bozazebodirarofapolex.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/24334896727.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/56640301151.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/s3ik8j8ssnh20r5099g9q85rd6/76262921863.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ced1fb56adc24ca0ace0b9c0bc139c3a/52973855163.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/dujanin.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3e99e27a486ed53de8760fd59d38e126/38646776240.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/zukojujopokizikop.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/56286770444.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/emngto3fbfgisd56p54ggim9a1/42744910137.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/wizefivexetunesufasuj.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/93951129533.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c5468740---10635722044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=complex+numbers+pdf+class+11+commercePDF 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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 11016 bytes
SHA-256: 9940fac9dc724379e8ee0f1824f8dc6e4a215d4daf67902eb3c74fdc7bc3b3b7
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 19168 bytes
SHA-256: 11eb784b850ebd15151ce7799103c03e296886c787b5410b0a48aa5288cbc9b6

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