Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f2b7a7143f0004…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 10:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28c7bcf7534c5e3cef183b6558d8d952 SHA-1: 5968dfc61c22073e18f939ebc63abe993fcbd224 SHA-256: b4f2b7a7143f0004ffd8d8a3f6e7523139efb551d81c9250d9db79c287e48bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chcial.ru/uplcv?utm_term=what+is+the+benzene+ring PDF link annotation
    • http://orchid-daikanyama.com/userfiles/file/penepogevexufoxekitusuzi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/fc8024ced4e5e4a28a0b947e572a8e8a/67627289441.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/40024245407.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2efa7289ed403bd68374f4a5d7167ff9/59079797411.pdfIn PDF document text
    • http://boxethai38.com/upload/file/lujedapofexa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a620fe8---6028654168.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zawosikanawukupodewemasi.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/3267483523.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/93550709939.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0440bcd2d9c345d941ca3a4c5fa1e335/safed.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79674612675.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a519a184c---rereli.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086181d64332---vamimiliz.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/82034377483.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608852b402b97---naxutesoxefam.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/36607399972.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109a270dfe80---82253356842.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/debejeme.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/53729822286.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5b4d9746986b2f53a4db3aeccf8e2122/gakakagelagaser.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900de01744c---99365155709.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/59638365969.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/29984555545.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/veferifolemuvisatubifar.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/19996d803d02290713290bf820bbe5cd/65250725591.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/47021289080.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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 10416 bytes
SHA-256: 334902278ca927af738971552d3cb335bea5882eae1bb294c8d8a8930aefaccf
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 16848 bytes
SHA-256: 30997543739a6c19a0e3ec20a876cf00a5aa2e6ae5acc440707602e14a421cfe
font_02_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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