Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24cf4e31e3eed65…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b70335e4d06ba2a25088afec9c469bdf SHA-1: 0bcfb6d6c60897cab179e8cdbc098325f0a99c4c SHA-256: c24cf4e31e3eed654fa0de4ef2396e32b9fe2eece0fd8723ca12f3e7365c0f7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links are likely designed to lure users into phishing scams or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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
  • 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://dok-vo.ru/userfiles/file/ratafago.pdf In PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210730162217.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/24631143900.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/wadamajazeni.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/wejexuraxamov.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vigekeruzilemuxoxibenom.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72c680fcb---dololuvake.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1f1647bc6bba49d44829d6a4192ec715/muledenijopavovunafufid.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160dda2e9ee159---73818299005.pdfIn PDF document text
    • http://regmac.net/userfiles/files/36133569265.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/28924355569.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18356d6a---57852537986.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/ralevaterokobowev.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/rezetigenijeka.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/21552557625.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/1172734733.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kegubonobajololamopuwid.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b036f549157---94497326023.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/27c507t1ej6ere70mdan3r6n93/revoj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6d854f04---26133880173.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/90756574240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nd+road+mapPDF 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_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 9888 bytes
SHA-256: 95633395ecaf75b93e954bba92307de5d514bb68b375e0740ff7bc84188a779e
font_01_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 15536 bytes
SHA-256: d5363376a57acde32a7e28f0b27a75b969de98fb532285c4900de2427551f4c4
font_02_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1