Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea35a2ec0f62879…

MALICIOUS

PDF

82.2 KB Created: 2021-07-04 21:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bf8b6e2f8cc938c3abd55f7d46e05df SHA-1: 2ae99583121b6549f4e14c3f8c322202721570e9 SHA-256: 5ea35a2ec0f6287900ad9e43b6e3d1ba6d395b0a915756b3f4df4951aa9649a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of numerous PDF links suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d84172a341d---17143100229.pdf In PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ce9e93138173cf4a87af10ffedd2ac1e/81322733375.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/vekev.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ee744b6e---lumox.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ab98ec5ca913c7c4975e80f95db9382c/77080766968.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mdois18vus5asvh7a90lvk1lj0/54525194374.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0026d6b7c6---bedafokuxigavutopanot.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tizefiniwibufexena.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48ba6d18f---15601034382.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d7a1800c8a4ea7a9f952087ce03a5966/vujijavitoxe.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/75436250993.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/826f9cc2f95bed4f13af0bcdb2e9744b/kedemusiropukod.pdfIn PDF document text
    • http://calisnt.com/uploads/files/gifajategozinabomir.pdfIn PDF document text
    • http://goref.ru/files/file/nosefobalogupavawobulimar.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab95eb8ba41---silup.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/58933030157.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ab963163---20117374819.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/79041308761.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f69c1f04---83363158631.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/13416826582.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdada0592---94769308242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=course+in+miracles+lesson+28PDF 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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 15728 bytes
SHA-256: 9a039f425cd9be1682e03fe7a2c052dc8cfa3409d97faece6e362343b90a7c5c
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 10752 bytes
SHA-256: 419a64b2c6539880f56826a04157961d1f35bad2bfa0e0d5ffc162c626b09e32

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