Malicious PDF — malware analysis report

Static analysis result for SHA-256 0312599d0816f79d…

MALICIOUS

PDF

70.7 KB Created: 2021-05-10 05:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62715ef08c48631e132cae01b4675b51 SHA-1: 1be2da6897c951011ab73f93660117438233a18f SHA-256: 0312599d0816f79d9d2e66865d817f46b62b7524323ea1177710199910babf40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608941e2af948---61536966372.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/71399114077bae011523c7a7540b42e3/31580985984.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081d42b6a325---kiwexo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dec939c455---xukasofuxalugivepaso.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16095b76e5ff54---lusidinaxogenorurenudop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nsljp9vfa1kf1noqe590c9f3gt/26674875053.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/vh208kgmfoqrq8kun8nf1gij4b/lebemidavozivipakivado.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cd93d7b4bfb55c69e8157283e063ab17/87247633403.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/666f01c21d40ac0f68f1211322c48b4a/zuvud.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1045a8dd0---mojomerovokidekefi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2e47cbcafe098258febeae59ea5570fa/bolagozolaruxitak.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33994e18ec58c50bae96a6154ed05c3d/44145276958.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/nevosotajanivenatiwapamoj.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/oh4jba4v1a5gi4c9gh29ur8jfk/lomojatavo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c335bf645---84904025659.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/3768827955.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/3010362667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=crude+oil+inventory+api+report+todayPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 4844 bytes
SHA-256: fa937fd00735bc99f6111c09007ad8c465d54f7778239f8f49b81393f9dab83c
font_01_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 11304 bytes
SHA-256: 8e08e1bcb25f8ccb6079ded61927e0256b0e7b1cc98ea46a68b0118776d87487