Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0672f960e608a4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 06:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b134e98cc25c94ff117ea0bf2b7f5ed7 SHA-1: d3b0e5565fcda0356623d3d5ae44019f321022ba SHA-256: eb0672f960e608a4290bfb06dc94a2ad1a7908e97b4775b0aee69d4037af2865
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. Embedded JavaScript was also detected, suggesting potential malicious activity such as redirection or further payload delivery. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jongauger.com/ckfinder/userfiles/files/luvefigul.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/93159407496.pdf
    • https://lotteppta.net/beta/assets/file/24823778376.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142fec5afc2c---pumesofuzudikoditis.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/guwedafutuniwimem.pdf
    • http://meadescafe.com/userfiles/file/bumozejuv.pdf
    • http://www.dereformasenalicante.com/archivos/files/33393546177.pdf
    • https://accuratesearch.com/userfiles/file/moxutezoz.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/48971353586.pdf
    • http://recrute.fr/files/files/49136963790.pdf
    • https://clubsecurite.fr/webroot/upload/files/jogogukixujixiwunujunogu.pdf
    • https://rkdestate.com/userfiles/file/69007219676.pdf
    • http://obkladacstvikolar.com/content/wujiwefitazu.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/186cf33dc133d6c3893473f08d813753/76683358557.pdf
    • http://on-video.com/movies/movie_data/file/nubozogibatefad.pdf
    • http://brenderup.ro/mm/file/votorena.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/noxes.pdf
    • http://alanaf.ru/userfiles/files/foraxamisalebo.pdf
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/9355474279.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/duwetafebinafinimodewog.pdf
    • http://myucpb.com/userfiles/file/69492027234.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d0c4f4716f36e4dcb880f560b5f3fd7e/82992311388.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5556de8e---79236700575.pdf
    • https://siam-royal-view.ru/data/files/95425630048.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mega+n64+emulator
    • 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_off0000d6f0.bin
3f3af2c361e34b94bbf168a23093d0a9b252bec52cf6926559179d0e0e97e089
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10528 bytes
font_01_sfnt_off0000ef03.bin
9ced0dbb168ae105d6ca79b751b90ec25921c4925769e749b19669b316284961
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 20240 bytes
font_02_sfnt_off0001239b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes