Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef72807d9ed8cbc…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 12:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a256d2fb5670f3431fb038ec2e1587c0 SHA-1: 3406470307ca790a74ee9d0a9d99b849f35ba869 SHA-256: 7ef72807d9ed8cbce6175bcf8241f1be1c36cb557d059d37a42555b94a3b21a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=theories+of+educational+leadership+and+management+pdf PDF link annotation
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be19e404a46---mabewebunawugekopadij.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/taduziro.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570e5228e9---31626575469.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c201ee5ad---tutimozaposuzawutabibin.pdfIn PDF document text
    • https://alev.az/userfiles/file/dezoronodujizilodiv.pdfIn PDF document text
    • http://seamacros.com/upload/file/laxulefemeneduminasovem.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/84872221046.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/67096384879.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/wifonajuxejazojimakuniges.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tibunamumomeguxejixadug.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146fc7fb97---bagenib.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/58646570288.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/kaxewepedupomafides.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pezosabuvavapebi.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/6902532818.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/80296774936.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfffbea0285---kazinufirutaruj.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/21792848605.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/nomagugizipodeluzodobemu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608289fd9e0da---pexexukitugolinaken.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/lujiterobi.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_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 11132 bytes
SHA-256: e27c87423911bb0974f650014144828dbfc15e83fc39cc36f009c0f573c7d0db
font_01_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 20076 bytes
SHA-256: 4fb3c8b32b50ca9d12e555fd1c894da11f0469e491202eee51a050bc03ea5713
font_02_sfnt_off00014c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1