Malicious PDF — malware analysis report

Static analysis result for SHA-256 7233a8d9eb3e37b1…

MALICIOUS

PDF

92.2 KB Created: 2021-07-06 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6390d0d14b16f76fa2e39b1466751107 SHA-1: e63884babe72a31e251189d90195c2c8e470ca4c SHA-256: 7233a8d9eb3e37b10bb7078a476934a5a96728ea6a7e7ba40e578b59a661b303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the links suggest a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=label+the+parts+of+a+leaf PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/daabb196c0d95cdb1d03bc5d0f8c919f/94428992745.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7186dgjoak1qh15vg1nmmlomc7/mizumuwopewefo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/dupoguweto.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b411a6adde38293572db3cb44f130037/27218010660.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/85177949281.pdfIn PDF document text
    • https://etimes.mn/uploads/files/58273064672.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/dd5ea5db8578e7d4482441838ddd9543/xiruziduburusajaworib.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2472974729---zatagajukewotonadotif.pdfIn PDF document text
    • http://betamarin.com/images/media/files/dipodanozikuvodasu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215201241195020.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325bf2b2b2---5359302679.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7mqt22v6ff9ecnqtrb39oqmj55/witupuwezefuwabede.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3b5487a344cfcc3140f9e366a9fe5c0a/ketotadugasovizabexekiz.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797190bf29a---newetefapava.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8d1bff7a79bc1beff959bdad5f469383/75196921120.pdfIn PDF document text
    • http://aqcons.vn/upload/files/lisalan.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/49104223494.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bab613ec401eb5a001c130aaec4ff8b1/fenodafutotujowojavulox.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/bevulejujumu.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/zakipaxoniz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f4165bcb04b50c8f94f11a9e7580fb7f/puturelarijifesedorama.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7042760548ea2a4890c3c0674a8ddc29/viraxiruwumopezetofusopi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ja0udued9vjqen662qd2f4utc/vamujomevizaninaxo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8d20a627a5720f5a0656f66f17d2c741/57035917370.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/potekenozagas.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_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 10356 bytes
SHA-256: a2e55a91cb81e0a7ea89ed6c58330b929a9d854e9f38b83023641118eaa1c535
font_01_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 18688 bytes
SHA-256: 6a9f5aa46354d684babfbbf3f48f0b96f34d0e0236313f1c801536aabca18a9e
font_02_sfnt_off00014baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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