Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9810d813a5576e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 15:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 011594fdbcef4a3e74dff790d9cc8fd2 SHA-1: 2ab833173ce74640cfa88892cd6a7f546721f647 SHA-256: 6d9810d813a5576ef206bd8dbce5b788a6f6a8d3ed56cd2341693b7ba7b6ed05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=download+messenger+for+android+phone PDF link annotation
    • http://lasermedia.cn/userfiles/file/80471850731.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fenudujumamonogixeduvorum.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3a0a1cf6a---nokubusevuzudoxovexewux.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408a959efaa---40989071887.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nowegemuluzabetapunepu.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/17280238151.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/zugabugez.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133728eed248---xerokadibanoga.pdfIn PDF document text
    • http://juha.be/_files/file/womoranutasoludanuwade.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/ruwapiwumukipilo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614707d0b7be8---duzugigidakelitabi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/snfcqph40eslgeh8246ru17q9m/lititozofapatotelexoler.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jomoruwonuzobewufeni.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc078a288---16848148144.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/82r79en76rnb1b5ag0ece5r0qq/66385669298.pdfIn PDF document text
    • http://sudeoksa.org/userfiles/file/20210914010828.pdfIn PDF document text
    • http://unseretochter.ch/images/file/boxetodupademo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613290401ab6c---74749378268.pdfIn PDF document text
    • http://retailcop.ca/files/10510865007.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7a5c2ef1---vonavigudesavenoba.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/walatiku.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4f310fe4---45676059868.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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10936 bytes
SHA-256: d2a250192c2744d91e43898d34b48fb081e07262c2e8fec4f25524390b6006ab
font_02_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 17476 bytes
SHA-256: 462c2c306d8a1e18c90d7c9759d10737ba224c18e929c9878515202c7e1208f9

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