Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c829c24655bc1f7…

MALICIOUS

PDF

81.2 KB Created: 2021-08-01 03:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d587db21bc70559877cc04b41c013403 SHA-1: 272b2d70a9da3f2da8aa284bee26c9755dede607 SHA-256: 3c829c24655bc1f78713b487b84528f1881448e54c6f45ee202dbfca6d96ad9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b48e6f31874---viluxiwut.pdf
    • http://ulv-fogger.es/d/files/11424544798.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f44df6387e3a40de8a69bf435336a531/1273815623.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8f20ff1cb6db216a1f62d44ebb6aee68/bumidasudoromepokile.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d2f17934---4444819674.pdf
    • http://h-st.nl/bestanden/files/48897630804.pdf
    • http://montgomery71.com/clients/34132/File/rotuxa.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/savezazima.pdf
    • https://techson-cctv.com/upload/file/6927747061.pdf
    • http://erictex.com/ufiles/files/64847547651.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/440891475c4b93fb66d148015258ca52/18146486380.pdf
    • https://hoalavender.net/upload/files/dunakiratu.pdf
    • http://oilmachineydy.com/d/files/257021525.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/84fa39f04090b69164665dd04c26dbc0/7886497700.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/67c97ba7adddb021f441309b902cc804/pajujuvepamuvokipidu.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8fa699bb683c0dd176faadbab1359e83/tofikaralubufofopadaka.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d69f0ae3bb4c52d8badd4ef7d7cb1c2d/80901709219.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078794817e61---vavusig.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca265d02bb---zabutojodimakojeligabero.pdf
    • http://hilimall.ae/uploads/files/41876276049.pdf
    • http://coiffurenais.com/userfiles/file/27891493009.pdf
    • https://alatheir.com/atheirwsfiles/file/20785511121.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=como+descargar+kof+2002+magic+plus+2+para+pc+full
    • 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_off0000d3fb.bin
3cb1cd98985cfdc6d58b2cb9832fa8466ccbf84f609225c0c40390ac39d21f24
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 11228 bytes
font_01_sfnt_off0000ee20.bin
5fedb72d406046d4d2ebb73c455f497a67e96795b0361cfc5ff129101848f38a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 17852 bytes
font_02_sfnt_off00011bc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes