Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fe5b6eba3c30c4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 15:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7975b36ffc82721433d22b1718ada9f2 SHA-1: cf98c998b2616be2f5e25e7b6960d87164469144 SHA-256: 38fe5b6eba3c30c4c3356813d0851907e5bafb1c6a43db5fc152b0341bb23d2f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure and link farm nature suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pravkniga.ru/files/userfiles/files/40854119037.pdf
    • http://cpghollywood.com/userfiles/files/boliluku.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9969cb2b---5503992277.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a5e417d7ab6536fe8ed231418429d098/47223875592.pdf
    • http://synergyproperty.com/images/files/kedabumitujuritutixadur.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309330ee18e---kamevasarexafiwotujajo.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136ec0dd5782---zesomorejaje.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/bonipuxujuv.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6751f0a5---40694276213.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd29386e5---fezonafov.pdf
    • http://hairfibers24.com/upload/file/79164814874.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/36545130114.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f78f304d---18127470920.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/j8mls9jct3nksdp6fgqn5pfv32/87898088339.pdf
    • http://wakesup.org/userfiles/file/butiriziloragudafodoxi.pdf
    • http://cobe-ing.it/userfiles/files/57078518256.pdf
    • http://youngdongtec.com/userfiles/file/49433644774.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7bdc84ce---jolebuv.pdf
    • http://svx.su/ffile/file/sodufiwuro.pdf
    • https://o2opr.co/userfiles/files/solifovuginonunikifi.pdf
    • https://temahr.hr/files/salorigize.pdf
    • http://batistar.fr/userfiles/file/27214836855.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/76588876579.pdf
    • https://domilot.com/uploader/files/46649781652.pdf
    • http://malagi.pl/user-files/fck/file/nefojunetefojo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=acode+powerful+code+editor
    • 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_off0000d8eb.bin
00a409547d61c2bb12ee15fac69bf417dc7d3a4b60ac10dfa94cd23db07dd5a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 17820 bytes
font_01_sfnt_off0001071f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16792 bytes
font_02_sfnt_off00011f36.bin
17a6270cc1a42a1df3eec39bd3cf79909d1169b59a6f47a612cd6ea60bff0746
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10344 bytes