Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99a11c22e3759c6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-03 16:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94b33374706251c1b1a36078edb4fac1 SHA-1: 8477c643de0f8ceb885c86428d61035480156442 SHA-256: f99a11c22e3759c627bbffd38705e050fc2bbc331ba3c1d7ea7f1a65414630aa
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The ML classifier strongly indicates maliciousness, and the heuristics suggest a pattern of SEO poisoning and disposable hosting to obscure the true source of the malicious PDFs. No scripts were extracted, but the overall intent appears to be directing users to download further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=network+analysis+and+synthesis+by+ravish+r+singh+pdf+download PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a69a6ea5e7a81a05e3a464f7ed823978/lifelejanofiso.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fikotexojamu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8573286c9---87196240338.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/lujivazezen.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/16393995350.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa6e8666c---88874437995.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3sobaifi853ohs9r26ebl8quu1/sisibom.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/15295376999.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9999b36072---48911018026.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/42634141a24cfb198bdf6f1f3577cb68/37736396521.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/zatekole.pdfIn PDF document text
    • http://contextuae.com/resimler/files/49645571534.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/33849992141.pdfIn PDF document text
    • http://omg.su/upload/File/sisipaxiguzinagifavisugos.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed38395a6---6482535701.pdfPDF link annotation
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f146668a85---xapikupikivetoxesaka.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/tuzalodiru.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6ddtll51mdc00cr9h37hbbfsb7/zijodewufurelogume.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b26ebb5---72765479781.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/81310931422.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/daxipefezemeturatubizeve.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/72d606d0a32c031480bf0d555c7e25f0/juzafurelodukuzukusipur.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_off0000b41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16376 bytes
SHA-256: 6b8df2235891c1457a4d5c6facaabe096a5f805a62b67d1cf7cb0aa972c0aa0e
font_02_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 11252 bytes
SHA-256: 558a8a227dcfdea4f9b8a929b300fa80fcd4f22b44089a18806ee61fa43c1dfe

Open this report in the interactive analyzer, or submit your own file for analysis.