Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b22810613c5efc0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 15:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67d3e20189ca0d54a3fb3fe3803359b1 SHA-1: 97f5360c0433038239b400c7fd13d63560004226 SHA-256: 8b22810613c5efc06d8b72f1910c7a768207a1005e16faeaefebe94443f5e3ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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=k40+gaming+edition+price+in+india PDF link annotation
    • https://sklepbonus.eu/userfiles/file/21578307217.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/33240638657.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/58238250401.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/zakapimijuribadoso.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurotanorazazutu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/jesixisimoxodof.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/junugazekuzorulenevat.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/sadewikunugefuworuj.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/gazuxefukisovulalifutade.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16132d06822452---84312070873.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26ca75549---64561233593.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147619bc2290---86905072986.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/46105594306.pdfIn PDF document text
    • https://questfran.com/broker-site/files/files/jabejajawade.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7489hvhaj2rk1liqvq169s2pp3/lomekewowakuv.pdfIn PDF document text
    • http://alltechsro.cz/files/36801899130.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/gowesiba.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/tonugimubowutegotu.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/rapibinevi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/konojajigobesujabulop.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/9098218557.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/74105340054.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109041945428833.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/kusizegevisidowo.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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 10832 bytes
SHA-256: 280f6c4767e28e9661f4e3ec43d6a2f96e68168b54f7e24786de30f18babadeb
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 16372 bytes
SHA-256: a5500b2d68852375a5ad76232c49e7691268add72c3baf7a220c7d303e13970d