Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9120793933edbd…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 17:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d5384f034de876228cf3753a24e75eb SHA-1: ca9e15cf346b3b648d066535c1ffac805f2989ff SHA-256: 9e9120793933edbdc15e41ebe123d1126b088b592589072614fd87782c46d3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. ClamAV and ML classifiers flagged this file as malicious, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating a pattern of disposable hosting for link farms. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=on+hotels+oceanfront PDF link annotation
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5d3d235e4975bbd58e44dc506f308804/34633272777.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/12981857652.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad1a05d899---87390085758.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/27347886788.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b897f082---7067088206.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/73877025374.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e8cb53a136e018d3e4a02fc6fcf50d11/90383932856.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9j6u20rq6v7vu6mm6sbtr0p4ss/52565086232.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c775429f---sagenid.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/garodatodajetobejibida.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8811b455f4---xisinatawek.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/wumewaj.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/888d5f5b341043be346d82fd994c03ae/9077238305.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/47e5e1599e800905cdce08d509e743d3/tipamagodupile.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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 17048 bytes
SHA-256: 58bb3eff4a89841437a28e34577324df6d97c31c1a3ffb4fbaa34cb15d8e8685
font_02_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 10368 bytes
SHA-256: b7f10118d371df286b89e8368ada71f447e3602d6faa844fc58656b6b811e81a