Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec81e078b1660548…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 06:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5802ec5e7de3229014523dd9927740a SHA-1: 3c44d0c4cee9da0facb1e5b82bd574ca848230ff SHA-256: ec81e078b1660548820526f09a165a3b15d79fb97bda47713fa9df1261cd18f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=copy+old+phone+to+new PDF link annotation
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60463876639.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/14104037201.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/dcd384e2b63d06d159160f541c5e5af3/kubizemixirerajidewalim.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/lumatagibeb.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/josanopiwexud.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/68370702134.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/78033957455.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210920221500.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da94c6207d---kerebogebakolujufojagum.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613520f89db17---56678256396.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/69527914725.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614275eea9c3e---7445308113.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/43527360323.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/20700180056.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96222751720.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/lodomisako.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/87515499177.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/rezarijisoboli.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/98462157288.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/63767393289.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/27201718306.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94c0c25e8---nasogiravexulo.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wumurakudupunoke.pdfIn PDF document text
    • https://asken.as/bilder/file/34537155520.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_off0000b858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06F 10196 bytes
SHA-256: 8705f22241d28d07d5ede59d7c83a85e37d653d77587afe074746be57af72030
font_02_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 16364 bytes
SHA-256: 42353fa4e00780a15055448affb54e3f8ba2647358be8c8cf9f83719982ca9cf

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