Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd469e369c653ff…

MALICIOUS

PDF

64.0 KB Created: 2021-05-15 13:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a0eb90be9fec4e88a79009601d34d64 SHA-1: cc042bc1fb426ae4dbc2b312eff3731c0a784851 SHA-256: 3cd469e369c653ff3a14b289c2463f4976766a5e9b4fe303df340c36fd9d6125
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2sl6d7iu3fa9r23lj9143oh33/wemonokumisi.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hugh5uubu12t76e8dhp8fe8pjn/vefew.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd717bb5d---toviwuzibum.pdf
    • http://www.aadhar-interior.com/userfiles/file/mimelobol.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/dabba97caf2897b3b352acff6863e54c/88242686045.pdf
    • http://kingalbertltd.com/uploadedfiles/file/zosakotetamarogezulipakej.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ea8f5bcac7c1f5ae58e863b808c6db45/ginetetidulitumutodeve.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22914dca1---26903193904.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/900542533a870163376b6f2082951697/54123487420.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c6db9b161af65787a25e38ed25a1f75f/73198655301.pdf
    • https://asset-books.com/userfiles/file/dumazojazuxuloluvazumo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b54fd7d69---86525960178.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608846ef3242b---72639923605.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/be1325210fbbbd846f394ca777336391/kilamikuberatu.pdf
    • http://ahcxdq.com/uploads/file/280133244556.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ambulance+service+nice+guidelines
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c8.bin
af8f4d9009fe7f4714cecf16cd266233a753992a47a6c8b16143de153bab9bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 5448 bytes

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