Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ea91508c1c4245…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 22:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb77f94f3d5001df9cb9beb73efc3500 SHA-1: f998ffee24597127a68b1e165e79d9d504fd019f SHA-256: 26ea91508c1c4245b1f460868467dec1f9b4f989d857f28081a745a4de1e6610
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URIs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc8e0be928bbbdb3019098035521debb/25346567949.pdf In PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/kekatajerewanex.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/xafusetazotafumowuvuk.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/14964b0d8e56bcceacf49464d8b78208/zujalituga.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pomozusexububenenifil.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/mepasitadipebapo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/92549119910.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8109162c89dbaf40311f016e1d2a98a0/resozuwud.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8e05bb8c39c9bb451a536cadef5a0c47/vuzinetixofizu.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/73556815792.pdfIn PDF document text
    • http://www.polni.si/Images/files/pomazofedujerudujoliweji.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/jinajadib.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/59447464362.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630048712.pdfIn PDF document text
    • https://bigpointpin.com/calisma2/files/uploads/sudikadovofimimifub.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/bigomaz.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/dawugizatunodilawixu.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/28178972372.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/74235196335.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/48406335304.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084759e924c7---sozezot.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ca374ad70793d39908a505f2262eb06c/xiligoguka.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/79126392920.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/juzonedasawedem.pdfIn PDF document text
    • http://nineslash.com/user_file/file/66227706356.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b317b8e9d1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+app+to+open+exe+files+on+androidPDF 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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 10648 bytes
SHA-256: 1804a6787e9caa48ec21604071baf5b58cd7fda21cf9591496a51b90fa0f8d5f
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 17276 bytes
SHA-256: ad1c833f443b8997a73fde3b6128b379b2d7ad17e68c6cef4e93f33501727f1a

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