Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0cdcb9a2f97042…

MALICIOUS

PDF

92.0 KB Created: 2021-09-04 08:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e223e0755b93289d37df409e7f746731 SHA-1: 758f60be2ccf07d4c15655e6d76ebb5f746c522b SHA-256: db0cdcb9a2f97042684da56bd8da5e8829cf0d48071b17711d2ed7df975fe496
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to evade analysis rather than convey information directly. The primary function appears to be redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ddd4d3ac461d3c5a3b2b9494db94b1b9/74368991268.pdf In PDF document text
    • https://fanaf.com/article_ressources/file/pelek.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/32096229402.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/18976756655.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/65529106210.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/ramox.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/zaforetil.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108f941e543d---12905765604.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ee5cab6afaf0bd8e5d29457cf89eb42f/zomozon.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/gojitibawonidifokunamane.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06528305b---1155378621.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/25423742298.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc48466b7c1---doxivusud.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/6302755174.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2470b41e---tunoxoludolezexalo.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/90407166485.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/30858730617.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/34953585917.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/50962686051.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ihckkffr3i874asj2ugetf9mr2/kifaluvujug.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901002114.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1874484b---33695417692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=significado+de+manual+en+ingl%C3%A9sPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 24972 bytes
SHA-256: 4c5ba79c2633d7180bec5affc46187688f82cd004455c53c0fa24ac509fa9dc3
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 16180 bytes
SHA-256: 1d421b758c542d3021598db92ccb08b85fa73f750ac83168a6d2ad315eb4a8a7
font_03_sfnt_off00014760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14760 10948 bytes
SHA-256: 2c215502e61be60292d7b94dc9af15a0b2af2c18e2e665807c888e35525a0b5d

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