Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cded29ca8c9f31…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 14:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f021cd23b93dd0c4140fcfd879d946b1 SHA-1: d0a6de8e87cd0d21cd5a1b6c0ace63143b5e6e4a SHA-256: f1cded29ca8c9f3152026de502df5053c8085d4ce64b0edeeccefcff8dde5a6a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. These links appear to form a link farm designed to lure victims by referencing search terms like 'gta san andreas phone cheats'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58ea6ae44---10571923894.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161303c0aeaa2d---20487350551.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/10180481657.pdf
    • http://youngshiny.com/userfiles/file/1631008337.pdf
    • http://orem.mn/uploads/files/ditobopilelaf.pdf
    • https://whitesal.com/data/images/file/2978_20210914182410.pdf
    • https://fortworthdental.net/cmsCart/upload/file/95499557380.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161493fcfb7a3b---nupujesasulo.pdf
    • http://kraemer-duennebacke.de/files/file/numoxido.pdf
    • http://sobateracota.ro/mm/file/topevi.pdf
    • http://langmoon.jp/js/upload/files/ranisatola.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/98965123874.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/95460182243.pdf
    • http://uniradioweb.info/userfiles/file/zisipojotaf.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/wovekijemedakufulufa.pdf
    • http://siblom.ru/files/upload/file/laninujizinovi.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/wofetexisajafax.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/xelubumede.pdf
    • http://gadkowski.pl/repository/filemanager/file/fozetekom.pdf
    • http://bhttourist.com/upload/fckimagesfile/vipisewuva.pdf
    • https://loyallcanada.com/editor_files/file/83408721364.pdf
    • http://gramercygrand.ru/files/file/23511259962.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/vobovegesumapowiz.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cd10035d---73866193895.pdf
    • https://angkorphotographyguide.com/userfiles/file/bixanumituzupizeteri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+san+andreas+phone+cheats
    • 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_off0000b0a6.bin
c271159e6e13763f4a67c7dbd9e858049163a5a34d1d47b4b63410d6c9a360c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 10512 bytes
font_01_sfnt_off0000c88b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 16792 bytes
font_02_sfnt_off0000e09d.bin
dca74ff42c2ecfb60ef927d2e0bd3222d9309e0cd15b35303d0472dbd5486bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 14324 bytes