Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d4fcf4c02f6d7a…

MALICIOUS

PDF

137.5 KB Created: 2021-08-01 00:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b45e68beb14df12244a0021be8a83ac1 SHA-1: fea229f5244e590ca4fca2f5a1a6e930e03e2d3a SHA-256: 22d4fcf4c02f6d7a1c8ec1bbcb8b697c25cf442a7a8956b05e01c59069445b05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68aaf23eb---badufetevuzewezit.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e8c3f4eba3561dd10823a02455a97b8c/ratuzutetezali.pdfIn PDF document text
    • https://hirurgija.me//files/70135787908.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zubirisisore.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/53284840451.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8e0e34335---65232827262.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/pusifejiwasegojoxuni.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/41273427016.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2f751b2c---80054294626.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd71a2f72---xejemimex.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/futavexaweniluvotedanudiw.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa499453b61---xadularewifa.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/50153995141.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b543cb55a33---99269039372.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f235676bb89---xobezupumixagit.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/xapigame.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/tisoromenitosot.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sscg1t37gdj3v6llee0eq6sa65/xeriv.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d307203301c---31607969041.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609465a5a5029---15374923223.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869e9e99869---jikefegoji.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kegekeveteragurevuvej.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/jofizofekexozagonekaxuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+put+staples+in+a+swingline+staple+gunPDF 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_off0001b536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B536 18756 bytes
SHA-256: fd426335613aabee334d3f270a00157a0c02fbfb8d1d69571394143c52dbfa85
font_01_sfnt_off0001e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF49 10504 bytes
SHA-256: 516792b058dd2510247ec4b0934af6d7e22a1fa8bfdba83c43da6fe0ebd1fcda

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