Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb25a246979505a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-15 16:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb891fcda5817a0733c709f803152d51 SHA-1: 7b93c73ea997ed4e26ee3876e41632cce454ecf2 SHA-256: 9eb25a246979505a4b112ff6f0ab766c734e7f5bcf649b19819c57ccf301766f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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 http://zlzljc.com/uploadfile/file///2021090408170755.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e14ba06f3---75811457183.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c4879dc8f0de7e04e452b1260098fe9b/megawilovopopefaba.pdfIn PDF document text
    • http://pmke.cz/pictures/files/juwamowo.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gagodawirigolujemi.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/4042496532.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bc7cf0099025f701df8a7c3b4311c374/vuxopubetof.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/53618230115.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/82814608603.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e72cd711b874adaa7f1af893c5b5785a/6547297525.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2eae749db---ruxezuliwinatujolipapedip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e5781d12---67123352980.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/67917742715.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wetiwagowavozovufe.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/wawedagetinikisovokome.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/nadatedu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdff8a1ad8---jobarasumesis.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/11508703436.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140288b36ada---wunokoditijukiduji.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/38649800266.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/noxina.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/90862731934.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/73441383640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=spoof+pogo+iphonePDF 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_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 18804 bytes
SHA-256: 7559c701075ca3ad1d6784aad40b8bebfb17ea6cc5aa8899ec62d21277e87448
font_01_sfnt_off000134ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AC 10136 bytes
SHA-256: 2dbde5ec09ae16d3ba397fdcf7eed95b8e33a2b4dde96d31f8c9df1f53100575
font_02_sfnt_off00014b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1