Malicious PDF — malware analysis report

Static analysis result for SHA-256 593cfb19d0ec64e6…

MALICIOUS

PDF

70.8 KB Created: 2021-08-21 18:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 346801b44281f4230113fda89ecbc716 SHA-1: 0fbd032907d4845c660d2debf655df81141691ce SHA-256: 593cfb19d0ec64e602fdfe08571644e89a6a5554f72efb2345bcdf05ae7e1bfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8685

Heuristics 5

  • 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
  • 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://khaskhaan.mn/uploads/userfiles/files/nogabazipoxuzewutetubadu.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cda7ffd1d7c303975771865e962b976e/bovuvaxevegetukomoj.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15959e191a---kuwarexonodedigener.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607489e76f3e9---84374268143.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/mafarefafeparurefujofa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdad6ec95f---xizubovas.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/66025057503.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/34857235561.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab958ae8f89---39719691385.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/357980cd69f883a4bbe88275ea53bd84/voberogukizirukilofatagu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/506b52b1e24afc10d6007c28cc4ac7fd/tidivif.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/zowizejowepawovepuraxines.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/dapodux.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • http://contelex.it/userfiles/files/70238585207.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/92074824156.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dea435111---vuwetitibom.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/33898476166.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9eddbc517---mebozepudagulukutedon.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vurux.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/60240023914.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ef7urn6g76rjnubflaim1ccgoj/kimutixutolibeva.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/jobawupokabofijawexug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tmm+engineering+sdn+bhdPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 17788 bytes
SHA-256: 7cafb97da1c01416818712f79633966942498198cd00a7ccaf9b2827b46c7b2f
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1