Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27841241df2c76d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 04:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d2a98cfbee91d3310da4e4c46e304f1 SHA-1: a4cef8387e67a0b9a14b83bfea27026ee40db365 SHA-256: f27841241df2c76d1e7f9583f2b81cccdc756d0bd322842e18069c173598b374
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many pointing to PDFs hosted on compromised WordPress sites and disposable hosting. This suggests a link farm intended for SEO poisoning or phishing, likely leveraging the embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=unit+15+electrical+circuits+worksheet+b+parallel+circuit+problems+answers PDF link annotation
    • https://tort-art.ru/userfiles/file/kupomevofigoridapix.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6ee8652a---91383299047.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/26274316985.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f84c966903b3cf30524fc0e7c5b205dd/57326182678.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe72879bbb---8020118999.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/pisuloluribobu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebafb7ebb3---goxakugawuxu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac4ac6a340---33958413210.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/btfhtm50mhtko5mgupisnnna7i/9206657468.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772e2892f6f---jabogedoxuzobo.pdfIn PDF document text
    • http://industrialdevices.in/uploads/36829299441.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/47618664051.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de8778c57---tamuwebetupum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def1946a08f---sasuw.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/99631789539.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/15196679122.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b969e4317f---govumodazuremarezafonijav.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/nepusakiwepa.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9a895a33731aa14f20758db045b99032/82162958703.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/dedupelapuwoji.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/watoju.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/37552626556.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/45209444630.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6809f0e71166d92ac028696bc53a3e31/89414013324.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_off0000b7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C6 11252 bytes
SHA-256: 555614449e0e18fcdc545e68554ba59ba75d37fdb1dac0e159aad5d797c38066
font_01_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 15412 bytes
SHA-256: c0135db65d571461b6f2d90c42e5a26793c0f55918f65fbd441126780fe014e6