Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e09ce9d7ddec64f…

MALICIOUS

PDF

109.9 KB Created: 2021-09-04 20:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d50d7d7ee7d5e66283a8fed4a69c5d84 SHA-1: 6c3bea36e97d4285be51aed9b1abbaa8f16a29db SHA-256: 4e09ce9d7ddec64ff7a7dedeb973d0c71ad87faf85060a65f15308a2f6ba7dfb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/24251292463.pdf
    • http://sartoriaventurini.com/userfiles/files/wurasopitaxirono.pdf
    • http://vinabomi.com/uploads/userfiles/file/xamaxofelavofilulikor.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896f6aa11d---lerovoketapufis.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/xunametexen.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090801998469---21990077859.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/moperejosebetegomebosug.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f2173548b58---14927646511.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89051686527.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd07ab062d85f72f94683ec93a4491b1/24685619574.pdf
    • https://actorconseil.com/files/file/dusulokujuso.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c01c22177---10542941214.pdf
    • http://afghansolar.com/userfiles/file/72368533234.pdf
    • http://finalstage.biz/js/upload/files/64479635868.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210706_121743.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/71479464441.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/goq8g6nfj441mv8986rvhfka67/4341769855.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7145a5585d---32502544254.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/98bd08af1f89ced46d3c82da886e5782/20806028540.pdf
    • http://highendschmiede.de/highendfiles/file/56777287859.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2baec8e1d1---pirel.pdf
    • http://purofirstli.com/userfiles/files/76138880835.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e08200d6536---niwimiwijadezexix.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dell+poweredge+r630+server+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001450b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450B 16792 bytes
font_01_sfnt_off00015d1d.bin
8999c1ea1f1674592c65b1efe316efae5f85808b7f6bf6cad3b475cef2b79e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1D 19316 bytes
font_02_sfnt_off00018f9c.bin
d8f35d2eea9321a93d8db2d239ee5cc32bd42655d3c0eb6688d0467114d449cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9C 11260 bytes