Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfe1ac9d794b0cb…

MALICIOUS

PDF

79.6 KB Created: 2021-07-02 23:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 884a3ed4c10de5a67ef73dad1ecb57fb SHA-1: 5040f880e36a015d40c6f6242366fc6d89b0958f SHA-256: ccfe1ac9d794b0cb676296a9f03a7e15b8f0b177f8e7fbe60914873c4d33845f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to various WordPress sites, many of which appear to be compromised or used for hosting PDF files. The presence of a link farm on disposable hosting and algorithmically generated URLs suggests an attempt to obscure the final destination, likely a phishing page or a malware download server. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f64d0f8a99e76a95dffa7cd08880bb/70448693234.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3003cd653f54dc5c4ed5ff40ea6d0f23/72808707431.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d545eb5dd---notaji.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/83925973576.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vogobenavakufabedepitoj.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xozadib.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/07190e3cd40c36485ecdc635d3ba4a81/75048812605.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kunimepogolasetunugixax.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8c126dae3726d05c42d1564b700de7f9/38581341985.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wulitulibovekuzapi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/70997930083.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/792ad7bf12a79ce8c1ec1225ea70e499/53357989479.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5h9bmqmae1mucepb2d7armiq5u/93315547635.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/77046b4f1084f551bebb641c01ef8fb1/tiwizikev.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/topubuxe.pdfIn PDF document text
    • http://vinmexindia.com/uploads/sokiwobozukemavemo.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a458a5748---14025104347.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/993635239bef8330a9d05852f9002d00/66496359663.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/n8653asavd0oja597ocfjs33v7/54706064737.pdfIn PDF document text
    • http://jfe.hk/userfiles/50602535932.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/dd544966f575fdeabcab681396a7a907/sitejifotelevazajenejala.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e158a9c67b9db0fa868268d52a97c4fb/pazamatojuwivalu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/96e6d39a74c1ffbf982725899dc7cfd9/xafesevelalaj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e228359f---47407551302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=thumb+and+fingerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 16832 bytes
SHA-256: 879374db0709fbb65381dab5e146288f549cee6cf29ffe307971638550e35c2d

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