Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a288fbd4a4e083…

MALICIOUS

PDF

85.2 KB Created: 2021-07-29 19:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 01f69b53fe4b11733983f750cedfc832 SHA-1: 2dc7efb93f1d4800fcdd037633cb520924ae05b3 SHA-256: 26a288fbd4a4e083bb6757917426c06932ca45563bcf7aaccd02c18d7d8fccab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware-hosting pages, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ssfbop146tm97gfm957l6vn8ek/28100429733.pdf In PDF document text
    • https://akapacha.com/userfiles/file/82549117337.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a26704b33b309dc96c0d4e1fb4b72172/kitagubuxusuxuwed.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/46113082219.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/33790820990.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/3014544904.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/64215327177.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/67540754667.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wopoxuzulewi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/84400517180.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/59421283987.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ae13dd745---8580675095.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a750761ea73---sivepoxoginalov.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/83668185598.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1cd7b36f7a6c07f38309c62c2a784f54/47705125685.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/fabofilufilisobilefitemi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a9a79e7e---malarexegerokiwaxepoxav.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f50c9bce96620dd27d04950c165d29e6/sepefopos.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/33392346669.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/j3hhn6e04duljesnbg9gqmghuo/59216394981.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/17457158157.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/55253302821.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d204080fc3---64536796698.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/48748771714.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/62491092015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tap+titans+2+equipment+listPDF 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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16752 bytes
SHA-256: c6bd1662bffe94cad164698da7f840986251582525e8f64c69d10a025d5d7874
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 10520 bytes
SHA-256: bf5dfb4c337502ffeb2e94fb26d3c406836f50b9090acd4b6599a8bd52d9582f
font_02_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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