Malicious PDF — malware analysis report

Static analysis result for SHA-256 6537c4f285de4ebb…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 23:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76053248bf2d89d07c8ca786fbf98505 SHA-1: 59adb4aab481b31aa356a3aacb720e8c3271da56 SHA-256: 6537c4f285de4ebb1fddf3c2c79151d3a31d879afc2ff95285d4d239b6ecdd60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://champion-osk.pl/userfiles/file/94550084550.pdf In PDF document text
    • http://fmi.lu/userfiles/files/37548236824.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a00a725da---dadeboxi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b2a3d6675e106b28fec09568add32915/65239068904.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/64861014663.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/e7088a4a4b2afab0ef1fadaaaac7b098/wozix.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160844e007468a---96858680957.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/10778167596.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/57590603383.pdfIn PDF document text
    • http://polletnv.be/uploads/files/zevukape.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060814023067.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a800da9091b---lusejodivifavitixuvuruni.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sexixosox.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605133508.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071656800a56---7358278568.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nibefovetolurafev.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p6omupv36d2e3t6l5dbbadd8mm/43322562583.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/tubetomufumoj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72168881840.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e28792b20---bopuwaxetamo.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04dea259b---fisamekekejejol.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6f04cae25d2f79df30a392826e06fccb/fikewesopirazijolimodule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=papules+on+footPDF link annotation
    • 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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10260 bytes
SHA-256: 6c2049d9457d0af2edafa805ebf9f87257b8b2593d2f33e004b4b8b8c507e599
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16676 bytes
SHA-256: 41b0902d2a2e2e5a1f4e5ffe9937d73efb4c81eaa25c12b6d28186ed8db15521
font_02_sfnt_off00013b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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