Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d7546d4b6cdbd3…

MALICIOUS

PDF

65.2 KB Created: 2021-10-10 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e4c6e0e21edf6a1d8ded668d3b1c039 SHA-1: af0e9bd3c988c3733a144f5d1b9087b4184cd1cf SHA-256: b4d7546d4b6cdbd306d5d3ca150250dbcacdc047b0432d657e5010a29805a40a
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, with many embedded URLs pointing to disposable hosting and compromised CMS uploads. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gocash2u.xyz/userfiles/file/76616115529.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6db5985503f4743a046ce5310e54f379/ritejeku.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/koporedor.pdfIn PDF document text
    • http://thaide.org/userfiles/file/pezagovosup.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9b196d4ebbd16f2b051f9e6f6e708170/89667523075.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/9861421246.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/41348752285.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bf0c5d960---mipugol.pdfIn PDF document text
    • http://fullx.net/files/pijobe.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/74281991932.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/53673395835.pdfIn PDF document text
    • https://emmaushuis.org/pages/mozilarat.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/30178242168.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/30583188268.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/78900056822.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/5060313481.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/93748350330.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mifigixeremusodasupew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=naming+guardians+in+willPDF 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_off0000c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 17396 bytes
SHA-256: 162a38f1f24b48afa8e0ea8ea91c63b99f59819a3c82927f6ab1fcac8f9514a7

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