Malicious PDF — malware analysis report

Static analysis result for SHA-256 da81f2b5b6d16a9c…

MALICIOUS

PDF

95.0 KB Created: 2021-06-27 22:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a903a8951281783f15a067403cf6587 SHA-1: 05c7c3641deac7c75c06ee1dd0eb429fe9109a3d SHA-256: da81f2b5b6d16a9cf6080a33e8a6647f9723a2e8b0d9724097cecf2102f1f789
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 as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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 https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4abc44c5f8ce8a4332733579254f0764/podalozojusatuvafenigane.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc39911d53676efda8cdaf1737a7afa6/nusojusomesa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d168a6f8d---84727267784.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3338d1d580230396d5e5b52df1716f38/16523849879.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/47747936335.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c4b655bd2a9a54c20045d06f47df4c8d/zebagonajanewa.pdfIn PDF document text
    • https://windsbs.biz/files/file/45342538435.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/xalupowikizedoli.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd239dccef---44094511083.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/rimorozep.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/wenakufeboxo.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fonavenulizil.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qj9snsdo1900ne2dnsj36933a4/sijojiduwaviwasisoserode.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4c5c7621c2be5667644a0e22b6171ac0/43879373178.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608205a0452ec---67122104827.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/13844727800.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/crq1i8tck1n2g0eeintugs6890/wunewegowuputadenupazobi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/78435743721.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b60310814d0e9453d14f07d60450fa34/kowoxorerifolo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8e7f14567caec21ff9955aabbaf37bf2/befejetabamutijizev.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6843dbd8f79aed30c5c88bdc7128c855/nofibugejafezidotiwifam.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098326ac8a57---fimamasuzutetitude.pdfIn PDF document text
    • https://brod-plovdiv.com/images/94668289010.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f9e58a21e5b1b8b416ea04134b09aeac/71145748509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=time+connectives+powerpointPDF 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_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 10440 bytes
SHA-256: 6bcfaa268b941811df56198e013da9a0505202b90f7da9ee8f5e4233e105eba8
font_02_sfnt_off00013f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F39 17572 bytes
SHA-256: e9b5db62e9638dfc0bfe70f0740b809c2f90aed8cbd7acd6963919722e8624bb

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