Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc1c1aa98b5254e…

MALICIOUS

PDF

57.8 KB Created: 2021-05-16 14:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 098e3cd97523700bd8d4c9ded1b4c533 SHA-1: 82f0a6dc3147be28515b6230c8827f0cd8653696 SHA-256: 7cc1c1aa98b5254e33a7a66768877531d439e3318434c9e33df517fef68e634e
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other PDF files. The embedded URLs, while some are marked benign, contribute to the overall pattern of a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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 https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6af6446e11192fc3d16c6696139b939a/sezobu.pdf
    • http://bannails.com/fckeditor_userfiles/file/gefuf.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a440b0cd3---70153720745.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3bd0606368ac42bd4709ea79e11fbb7d/5876694915.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08acdeb234---38103938765.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8e7ac30---tubiruti.pdf
    • http://a-kamen.com/userfiles/file/52287279945.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/aa8bd147e0271fbcac918583b50cc4d3/98691053888.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507083150.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/27i9lqo4msgmafht0pbv92bc5j/70088938379.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/jonunup.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/lejapakupixis.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160806ecf22bc1---11018840278.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17288289b---xamurosazaweg.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807d8050db2---tejukepogozebifeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+phone+backup+to+pc+software
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce61.bin
2b7bcc5e206d185ca89a18a4eb8ccf207273dc65dafa90fd1bd2b15a29dd9021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 5556 bytes

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