Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dcb05ac58ec781…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 23:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3c86045ee9e6a57c3a09ee500eb2bc4 SHA-1: 72a12056622cf0f4a078aa1f49064c66b286ee60 SHA-256: b0dcb05ac58ec781f70f3403b79962e242a59221b1c796d6c59ef608df2ae5ab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://truckforceone.com/upload/editor/file/wojonapisolikixiwufeluter.pdf In PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/98675987831.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/90033173855.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6867291481.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/zodejuxakewuj.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5cf56d50d4e5ec45b42c750b47912e63/wodolis.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f5993098---79228957923.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/rorafapamowerobujedum.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c3c33dab---dagul.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/439f773d2323a6181e999d7057b50660/dagusufubepa.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/49351424047.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/josudumuxidufosuregolij.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/12970522782.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127503bb71c8---besomakefexuka.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91165d5ef---jubafewisefakonuzalexi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac0ea094e---50508564542.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210627012859.pdfIn PDF document text
    • https://aneri12.cz/res/file/75099392751.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b2cb8bb975a8c963962022dc74572f2f/kiromatexevif.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/52396c2f02fa04a7fb5f4d1105ba2d8c/widonavox.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fif104a0ddh818qghv5bh1eseg/81701529238.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/79805616211.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/zidarorejirox.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/xoxiwizuwezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=difference+between+intrapersonal+and+interpersonal+communication+pdfPDF 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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16648 bytes
SHA-256: fe8e92aeeb06d5ac39a9db8c9f0c0d9fb2da6382606275f8d495af83a0cd71cf
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 11108 bytes
SHA-256: 4356a6a2e847d6e52e42bdecc99c5b0e1a195d08e35ad80afc0f761f7be6d317