Malicious PDF — malware analysis report

Static analysis result for SHA-256 f020e83f8baa1a0f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 06:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e280f2a49eefcf161b68ef0af28c823 SHA-1: 7e98c23acaa25992a9cc15b17aed1ebf9bf71362 SHA-256: f020e83f8baa1a0f66dc687336b8f0b2c108bafee35da077c5126c49d0191c31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm and a phishing trojan, with a high ML classifier score and ClamAV detection. The embedded URLs point to various websites, some of which are hosted on compromised CMS uploads, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the overall structure and detection indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ferropula.hr/files/mujijodugoma.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16099f3ff4d06b---22538483036.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b4a0158d---58607407395.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zatebawugitepakus.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305f0c337fa---gitenamikurapeg.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/6406290685.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050ad4415de---bagapuxerorebokufu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/nudura.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/marevovivixinesebi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/miweruwaku.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/98485329877.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c0c823eb5---3596963153.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210621022030.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/pisududakifuje.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tuwibarejonoxaze.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/fitunegivikoma.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/64614013750.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nkcbi7ev4o9n8oa3ve0qq2sv74/77038684286.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/sasoxupet.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/foxoruworasafawenupobe.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/84b1755dc8bad3c6b7c532e77f9f1dd9/zesekanivokinoxiru.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/ruzugorof.pdfIn PDF document text
    • http://unseretochter.ch/images/file/12190929302.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/watagavikefanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cory+doctorow+homeland+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10856 bytes
SHA-256: cf1a95b1ed401d19bd85da330f1f533a608988ad2932bd0c99c0473650b67233
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 19224 bytes
SHA-256: 815adfd23913d2285d0d21a87cddcc67d7c7c206ca32f7c811b70ec7bdb0ae2b
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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