Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc6226198db734b…

MALICIOUS

PDF

91.7 KB Created: 2021-08-15 00:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7184008349b11d717c6d96efe1b55450 SHA-1: c612b3679b0a4d1ed59e25b3c8deeeba817cf1e7 SHA-256: 8cc6226198db734b89e7b44f2f8bb1c1721f70e428775ccfbfd22c3e41fcb197
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests this is a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107cef657817---90181741019.pdf In PDF document text
    • http://zaintik.org/files/galeria/files/53762792974.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e32cb0cd0---fimetiteviboxupakivimo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/77bb51a7f3f6d98f343b66b6bd392473/54139962490.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9710b6d96b639fd72085cb1c918e89a0/63054709577.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/18451954097.pdfIn PDF document text
    • https://anfauglir.com/images/file/lonozafobudugax.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hlar5iihts7qc54eg2e73bgm9i/veveriwom.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d293b0c---28854963868.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/65762769335.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/pilemigoledenujudez.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/dinitirunib.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5e71d578306c858ef412478d36187fe3/46947208438.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ec12a412ab4883571419e7199cb2da7/15883422427.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/najute.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/13427033050.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b648aecfa---rarutarifevijivopemaxote.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d22e6f4fd603d017f49cc05ce48050c/lufuwabelupesofixaloze.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-5/20210605190941970386.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p55lcp3q1macqfg2j6i9n581cg/24831164526.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/7ff418rgcfelglgmv8it6q1ni5/pajalufovetudekizi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ece244ba4---zijerewo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pozegovewivalowabisofesa.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/67786600370.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607912fda365a---63014485696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=traducir+una+foto+de+ingles+a+espa%C3%B1ol+onlinePDF 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_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 18160 bytes
SHA-256: 4aad103093447e5a52921d4d97ec290fda4a5a748075f2029c93b973b68a8e9c
font_01_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 11064 bytes
SHA-256: d584e974ff632b688f198f178b5c8b6eb6d9fef525951747991cf874d0b69989
font_02_sfnt_off00014607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1