Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b05e6874d53fb83…

MALICIOUS

PDF

82.7 KB Created: 2021-08-19 09:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: be5db8e1e2bebbc995d604b4a8df9a89 SHA-1: 930a1d1a01aea5feb00b65d734ad165e8fef48d0 SHA-256: 5b05e6874d53fb832f10f5922fea8510e34b9dbcc6a71b5674c38b0a8d2fb098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=gta+san+andreas+mod+apk+cleo+menu PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a715033e6---ronatumalisinufaben.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea030107d---vekozetenitexitokan.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210608_D8B6D40DF88E616D.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210724040911_prsgxl.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/9ssb2vl3a9t4t9o15a4qnimii1/91246208352.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ad783a57b641ba9bf0c2a351f8b4da31/vopadamelavegaji.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/rujej.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/52088423495.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1f18da282805fbe944d1277c9cfc930d/30873315806.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/giregugov.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a251de6ba2afd945707d8b28a6544388/96467875061.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/62287347292.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ddea14caa6f9f5e4fc8da244f8b8f9b5/bogebalepinurese.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zurekifobafo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/54693987862.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/38782753250.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021728110361995.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed76058040---zumetubajape.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/14ca20a3c42ba4553e7834181bde3bdc/36439401760.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/mubefobivuboxodurez.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/16870026591.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ea78237---balizebagikofexenafipi.pdfIn PDF document text
    • 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_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 10812 bytes
SHA-256: 8edece49d9d64f7782cbd9af59c30ca5c60444f68b46c9f9154bd86d44224ce3
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16668 bytes
SHA-256: 05a3c9ab746e22a6e2696a7c0b759213054abce1681ce52f4b466a04fcd4d059
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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