Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f159b54361de40…

MALICIOUS

PDF

89.9 KB Created: 2021-08-14 20:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3e43720d9642d547cd990086deb2444 SHA-1: ec656d6bb25dc4c32f3c84da1d89c16ea45150ef SHA-256: f9f159b54361de40eb2fac3bf08669febf9b86dbb3fa40da54fe0db15b7a03a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e013260cb3c95475af6aad0dbc325b2/mizez.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/99586548597.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d708cc10b---38259758191.pdf
    • https://caribemed.com/userfiles/file/47633296090.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4809643173---gikanatozufakirezibavev.pdf
    • https://sinhadventure.com/uploads/file/welabu.pdf
    • http://plusk-car.com/js/upload/files/35712984850.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9e64954c---39033473685.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/pixidim.pdf
    • http://mjacz.cz/soubory/files/14675859761.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/73639456301.pdf
    • https://szaktel.hu/uploads/file/gijudumakufanabuze.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6939eada---fafixigasizoput.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b64bfb33fc9---surepuz.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/161099809a0a7f---68037567691.pdf
    • https://marblobathware.com/app/webroot/img/files/sikudosip.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a84bb7f12---29154917664.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e961b2a3ed---38646287770.pdf
    • http://studiosaletta.it/userfiles/files/dapitizokugiwojav.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7c69ecaf1f3dc70c3306de2b7db1ff47/96751869834.pdf
    • https://luathoanghuy.com/uploads/files/60864139659.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0b06647432de657ad437e46798bf0dba/gijeferojoj.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094094f85593---35021423872.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v51f6lvrmn4q25mqql0rkok0a4/nukasiworepeje.pdf
    • http://nowyhotelik.pl/userfiles/file/36571778512.pdf
    • https://alatheir.com/atheirwsfiles/file/nafawexeva.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/galanegotola.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+offline+geld+cheat+xbox+one
    • 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_off0000f924.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16792 bytes
font_01_sfnt_off0001113b.bin
534fb89b2d7f0163c09efe823fa34d43db854f828f0f7e7eeb2eab587f13fe10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 10904 bytes
font_02_sfnt_off00012a3a.bin
31c5adc12df9cc2217ec12db89dcec7b21e5a744beba042ad7df2b59e1386ddc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 18260 bytes