Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4457f708cea49a…

MALICIOUS

PDF

73.4 KB Created: 2021-07-02 14:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c67468b1f362ea6b611068ad4111e0d5 SHA-1: 22fdb03d26397fdb8e42f7d4483f158c1c2b52e6 SHA-256: bb4457f708cea49a6938bfbcee19bc83519f7ff1e5c7de2b2380ff2a81d4765a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://airshow-bg.com/file/zetikafodawowixafibifex.pdf
    • http://studiovalentini.eu/userfiles/files/lekisomavotam.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39c0be498---24714689139.pdf
    • https://adasms.fr/userfiles/file/wuvujolemafimizigaxi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0919fef28fab1fa412f10cd4e797a86b/fokuxunuk.pdf
    • http://rcp-ranstadt.us/files/pozuvema.pdf
    • http://asustainable.com/global/file/fowowavovijepunudo.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a08e4f223a7713bd1d7ab936e1d615d2/sutiromelaresu.pdf
    • http://on-video.com/movies/movie_data/file/suzafokavoxelonenar.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4eb06f432---wemufuwebudod.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7e24156362ea585e6b0ae3993af62814/sanatosuritedoritonekog.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e4facc3f1dc09c73593b88749bf787ed/taposititija.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bf83163---11843129665.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d8168f32---69757482482.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce7a00d47---82570421318.pdf
    • http://moriefrusca.com/userfiles/files/7726518032.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/211c1830e2a109b4cf85128572e8c090/11687270873.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfca2191484---27523969705.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/61baa871ed7bbd076c44059e1e71e19b/pogojej.pdf
    • https://hagepoorter.be/files/files/2031933018.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec16e8ca65---56049303469.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60aee93a7---77988812820.pdf
    • http://kleiberit.ru/files/file/96699838518.pdf
    • http://cheers-gifts.com/userfiles/99531789513.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/02f85aa10ab12522fcfd21a103459f50/66993329457.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=five+letter+words+ending+in+o
    • 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_off0000bd22.bin
f9cff6de1b9a8b3f1d8bdf6fa63d9c4f3f5ffacd013e2fa07e7734662f86b2d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 10388 bytes
font_01_sfnt_off0000d495.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 16792 bytes
font_02_sfnt_off0000eca7.bin
b4fd7f2c2967d89f703e4864c273cd140b101e7ac7035276c2c9e0ed3a71d166
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16868 bytes