Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bdbbb2b366fb3a…

MALICIOUS

PDF

107.9 KB Created: 2021-07-03 15:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90de319fdc191cfd3e52b0d8af7ceb72 SHA-1: bf26301fc0192e65571001c01e73610d01a14838 SHA-256: c3bdbbb2b366fb3afe7f6bebb67b18a99a8eae2725f1a2b7eae2c1b202506087
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b74a6acafdbf851832b8e70618579ec2/41719873665.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a557ba9dde6---tesokegata.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/33470585584.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c7f939b171f3e4c6dc1b30290951a0a2/kanebediropabajolosid.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093300b1a22b---lefenepaxivekured.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/12230711625.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c19b3edd9---zogaze.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/517c3ce8c47de07358a28df7aa428c10/86354388088.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160764336a4e2c---zevasogugatupe.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/as1uuvfpivp2ki6o84i3n4ql49/padijidukunadibup.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089155d9f8cb---pemub.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075cde60d2b0---3598025305.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1c8ac22e---tununiwozewagev.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/91162733633.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca07880f66---wekolejenakinutol.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/bibofisuzuxagerivamuf.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081224fbade5---lesaxop.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/bufupulodigafuxamawitozu.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/74744172693.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26901611e8da227ef372609aad4b1f50/37833336967.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/65668321833.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/93230328543.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c426d776a2dd5ff1ad54fc5e36be08c2/pupesujusezominogi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3765e47e---nijuzufuwanokonuvopotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+zeros+are+in+4+millionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 10500 bytes
SHA-256: fc50a9e58008c5ba251f65f590291748020fbf6a0af6f8c201b62fd995e47a5b
font_01_sfnt_off0001574b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574B 19616 bytes
SHA-256: 6924d6597d70db7e471e9cae13e67265744737f3e9b31e8faff1df50866ec40b
font_02_sfnt_off00018a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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