Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb638176d439590…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 17:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9f62d5337c04d0120b844cb0f91405a SHA-1: 36c8d029de0f011a335a462603ed903b08a8fcb5 SHA-256: 6bb638176d4395907546d61f2f3ae203c37a01c224ed103132ae23e6ee651cd6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bydnjl.com/userfiles/files/xinaxuvakakikug.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ed3444d5e---80171646057.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/nosesovazovoxum.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2104ef4---91134014542.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb850ae19f---kadenafoxovuvowaga.pdf
    • http://runo34.ru/attachments/file/4471014263.pdf
    • https://vildmarksjagt.dk/userfiles/file/75640683531.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/bufaxiwuvizesusamareti.pdf
    • http://macautemple.com/userfiles/file/masizafa.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160749f837aacd---52630947485.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/932ded8427fa2f8dd203cc320b18d483/sufiduvutaponovo.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a417cfd1ba434ac144da353debcbcbe6/51390460485.pdf
    • https://careersourceokaloosawalton.com/files/public/19169737897.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/me1oopqhjbmht0pqqguj2lr3mt/85613081942.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1e40baf12ea304b99f58ab014a5cfab/21871437362.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dugigatodurifovokin.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aa70942e1---mawodusuvisigevosodotofi.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/81569791564.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79a72176d---53159042379.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i2agdc1biso96h6muj5jrc99v0/zugiximutuwodukideje.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083104878f66---68126588840.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/iggncpia6flh6npci4t4f9kcf0/75728853481.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/64251005f4d215b25637062a6a3d8383/lovosaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=all+around+the+world+there+are+many+endangered+animals
    • 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_off0000ed05.bin
6429d70258a2e0f737375cf912eb9d1fd6537d86d2a4843cc95c7bc85da998ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16780 bytes
font_01_sfnt_off00011839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
font_02_sfnt_off00013050.bin
e3594685381f9c392a00711c8c78c901878ce528bbff927e94b423e2b9612280
pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10976 bytes