Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb4186d53d04bff…

MALICIOUS

PDF

71.1 KB Created: 2021-08-28 10:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 431243516a5d8907b721e3a3505734de SHA-1: f5b2d3f07fe1ffa158463c222934675b10198c13 SHA-256: bdb4186d53d04bffeeea382b181801042ae42bc3a4d03fbd64fc593ef4c852e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b483jufboumrmr3evbo1j323h1/ludefenoxigesawuginigo.pdf
    • http://torgoborud.org/images/file/12370556742.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac168da5cb8---rubodeduvorodonaxo.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8d3d9fa2b21f96cd15e7b0a09a5cc9df/71784917797.pdf
    • http://ikuma-car.com/js/upload/files/fofododowajumidesomuburad.pdf
    • http://arohitourandtravels.com/userfiles/file/50807500202.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/rexedeb.pdf
    • http://roland-toys.eu/userfiles/file/jedupagi.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e6ee8c966fa0922c69e4b099e76ebf2b/13480957376.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/lutobobexoz.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c9af322dd4886b55f33814ef93d449bb/75641430819.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd57b637c---garazazejasalizupodujisep.pdf
    • https://www.ijestr.com/ckfinder/userfiles/files/jopigexalosidejadokuz.pdf
    • http://goldenteriyaki.com/uploads/files/kupawuja.pdf
    • https://alixdemassy.fr/userfiles/file/zafabujipipi.pdf
    • http://gayaarchi.com/userfiles/file/20210527190639.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/40901399522.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00017dc0a7---54904727837.pdf
    • https://webmenuplus.com/images/file/lixixexire.pdf
    • http://omonetach.pl/foto/ilustracje/file/77261723683.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db88e7ea8c---8114738635.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/bomabadufonomupimi.pdf
    • https://imotrading.com/images/userfiles/fivifijoj.pdf
    • https://imagebeaute.fr/userfiles/file/44978084416.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202108060300198680.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+cdks+control+the+cell+cycle
    • 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_off0000b77e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 16792 bytes
font_01_sfnt_off0000cf95.bin
03ce0e8720919bbbd30f8e77570587a8ed15938a1dc1cadb5dc9eee16aa1156f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 10496 bytes
font_02_sfnt_off0000e76d.bin
1b7b97c53701f933b17efc64b153591c1bc424be6b8ba13ba3a6c44285cd35da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 15368 bytes