Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd94f7c8fcdbec6…

MALICIOUS

PDF

61.4 KB Created: 2021-09-29 02:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 602781b3cec860aff070804382bb5af2 SHA-1: f31a9bab65ba7e0f5e7b5ba7fcd57c1218f68acc SHA-256: ccd94f7c8fcdbec69fa697b572217dd1aaa52d7848a248a4c042059699921da0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6753

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://kanalizace-ul.cz/userfiles/file/30045278242.pdf
    • http://vibrobeton.by/pics/files/72332230562.pdf
    • http://domingo.hu/ckfinder/userfiles/files/bepenoretikeboroxikow.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/dabevaf.pdf
    • http://roycraft.ca/userfiles/file/pavewax.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613450801ba21---35551080711.pdf
    • http://npi-management.fr/ressource/site-image/files/67254855606.pdf
    • http://bmcnx.com/userfiles/file/rililiset.pdf
    • https://cobrawire.com/userfiles/files/rekanoset.pdf
    • http://volkshilfe-vlbg.at/images/content/files/24177843630.pdf
    • https://verner.lt/images/files/89142421728.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80d50f8b0---rarafuwa.pdf
    • http://pagyesa.org/userfiles/file/20210914185016.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/fexopofuxugedokuwuzurel.pdf
    • http://www.kevimotor-rock.hu/files/files/76653756197.pdf
    • https://carparts-fixture.com/file/file/92782617643.pdf
    • https://mobilieroccasion.fr/uploads/file/60484582916.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pljg1toj9evinvfaqocgodfrov/lixirebesemizok.pdf
    • http://tangneylaw.com/admin/images/file/13638185702.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/wejonowajaxo.pdf
    • http://guides2alpes.fr/uploads/file/31283678065.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=eternal+card+game+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD34 16792 bytes
font_01_sfnt_off0000c54b.bin
4bc7dcebb120db262c3063b80d28e78ebb4a8b3ded445e61ea5802969263d55b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC54B 10528 bytes

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