Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0d164ea3242d94…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 19:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3fa17d8331178085dc45a4eb4cfc8fc1 SHA-1: a61f48ef5efc61f2aa57d2d8493a095dfb893c86 SHA-256: ca0d164ea3242d94a809ea6e28a3def2a30110bef7403996a8185ed2fbe32bb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites or phishing pages. The presence of external URI links and compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=hpv+warts+on+feet PDF link annotation
    • https://condicionamentofisico.com/arquivos/file/23224549146.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/jefebod.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f754234f---57538243264.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/dojuxowug.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e47989115bbbbfa8ecbd1363290ae7c3/damiraw.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/xulidavoze.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b109844002---57530203750.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/avbmb6j9vckjkgq8bg9o824qp2/zagepivenew.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/lugeru.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607154b7a5811---15259754423.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d36c2e981---23427027670.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/puvikimatapofokisalap.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/kdqv6q7o6jrf6u6sf7vcuuprg7/85096514739.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88415947011.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/5200891119.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/76716735900.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/29331260426.pdfIn PDF document text
    • https://csodamalom.hu/files/files/tuput.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf577b34e---55917970331.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/62e1e101e92dce2571dd7c2342a5ae7c/fuluweralalikodud.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607830f5889fa---zuxutolimi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a53ca316---bejefon.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5bu043o30dqrb6bd7o5n41nvkg/mudexuzasasodi.pdfIn PDF document text
    • 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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10356 bytes
SHA-256: a3cf299f41fe3476138f76a6203d0a35cc104b83a96e91cd7204d6d11dfcec5a
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 17472 bytes
SHA-256: 43b844cee1c122a18254069e1a110743ff69942ebc28eefcdd08fc19eb7dfa4a

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