Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3e4db9a1f6b560…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 05:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 632bf6f55c83592597c2900d4e821b4a SHA-1: 15a5f1a890db38af20be0c65c075eed101bee7aa SHA-256: bb3e4db9a1f6b560887688257f5e4aa57d4ddd322ccd0fad34366e1aecb8ba35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, 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 0.9985

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://londonjip.com/userData/board/file/pevotenivasurudugupes.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6636e69d6b---85929001643.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b894770497b---10119122652.pdf
    • http://eurekaelearning.com/upload/news/file/tawudawobedilimenaze.pdf
    • http://93564497.com/userfiles/ripasebazekikitale.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076754db6e57---pigumafisuvaka.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5aef674b9cf5df1117f96cbb7fd31fd2/misotexapojoginewosolepek.pdf
    • https://helicopterleasingservices.com/userfiles/files/27214934288.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3220f04f9---wewizakem.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48059ce57---tewaxikilu.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/juturujuwigovalirobizuso.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1d1196d6---26599378930.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/begirov.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f0237e2c2c3cd0d9ef9fd47e5d558e5c/57894938176.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210611_23A1047CE66B2D3D.pdf
    • http://www.prieteniitehnicii.ro/documente/file/86001708422.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8f9d2835---50117102762.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd75824d1a6---fafalope.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3066db56acbbab73a76eedf07bc61f40/pujisozasuta.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a5886ea2b.pdf
    • http://pphjako.pl/userfiles/file/48652478038.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=main+clause+and+subordinate+clause+worksheets
    • 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_off0000cd17.bin
12810ea4340a989bd74f1d12816001477ba26f677ce33b746436c74ea63d1b11
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10876 bytes
font_01_sfnt_off0000e639.bin
126e8ab35462844d1c7a46c24e114bf293e69d36fff565ca2d072ef8ecc1e01f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 17280 bytes
font_02_sfnt_off00011341.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16792 bytes