Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9daf2340e8ad330…

MALICIOUS

PDF

78.9 KB Created: 2021-07-04 01:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41e49d2d20d2c35af91ac2f72776dd0f SHA-1: 838b8b14d80cbcd51b55f54519a7e0809b0f0d17 SHA-256: c9daf2340e8ad330bbfcc9f0564606778877aea94bd9b5b1da114ebf6c9b3812
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to potentially malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://buydecor.ru/uploads/files/18713070017.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/o2rq9r3ebcs1qr4ph5e230nps3/2303573657.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074902eb7ada---76270272294.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/45326028128.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/bevunitus.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/japamopepabanodonetonumi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e54d62f2eb9aad0df03b31554887c723/56100736976.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27faf16469---lejadesuxokewomimat.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/52075306180.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/derufefotikej.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/59ffc2e324d60c04ff11c6889ad0f42e/32689498833.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qk5t8a18gbetd2uutasjqd05ve/maxozidojav.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/kotabopevoxowusaga.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5c859659---zedako.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525124302.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b928456da7d9340ef27fe9f2e40993b2/46950682676.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/86974591526.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f252782e---bozemozur.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/20871798127.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/xadoluretemarelewijafik.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609209bd8db4a---99124156753.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/42865795493.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/gilinulodabepebef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=melliname+melliname+song+lyrics+in+tamilPDF link annotation
    • 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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 16960 bytes
SHA-256: ec9f864f5e3a4899aae966daf9b83a080c3325a7dbc66b47aac29fdf075693e0
font_01_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10680 bytes
SHA-256: c06198fe828a54ab0a36877e0103303498926de19810a0d93cbb5f1767013a3d
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1