Malicious PDF — malware analysis report

Static analysis result for SHA-256 453d32173439e651…

MALICIOUS

PDF

109.9 KB Created: 2021-06-10 21:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fd3d9e45c7e85a4aa7f15421e1f1ea71 SHA-1: 51359fcf1748f67cb1249edc4b4be7c71b2fb0ae SHA-256: 453d32173439e6512a4dac971ebd015f86063e04936d8308b3f3fc94a12c07a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These sites likely host further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

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://medvor.ru/uplcv?utm_term=windows+7+sp2+32+bit+iso PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e852c4a2c6---gugudol.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/94bf452871372c135bbd767e92df9e1a/tufogepeg.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9321f2149db5bc7196cb46b0805d7d9c/45853440080.pdfIn PDF document text
    • http://dalaichau.com/files/kewuwalonenomo.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc83ab0a880---97244890970.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xelipona.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81816ad2ec18ae4ba03474b3fd9a3a29/vokuwulisokobividibuj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608abec66b112---54121416147.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/86b3f6e55ca5c97560edc8a3c4d979bc/65557858784.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc954b7ab---91196359101.pdfIn PDF document text
    • http://premium-h.info/files/files/kuvusokoxogebulamukumuxi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/vimafupojir.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4b580d3bb9a016cbcea30aa9fc927351/90150662958.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e95016440---wozedotakoselopavasokub.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bcb3aba536cbcd37530861355b34ed7a/mufidumifuziza.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a29eec19a7f---mewete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16556 5236 bytes
SHA-256: 8149aa916a381b000c78d89ddfad9902b05dbf8f88b86a06ce736688e7758c99
font_01_sfnt_off00017757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17757 16092 bytes
SHA-256: 661d44f181348756b7613d7dd50314225a14ac5dfdc63f86d92ef2040130838c