Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1ecfa12b92eceb…

MALICIOUS

PDF

102.7 KB Created: 2021-09-20 05:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84afec11239c76c0724858da0483ab68 SHA-1: a3a3963bd41e8ff700f0469b63d41596faf8b562 SHA-256: ff1ecfa12b92ecebe0c0242b0efa4a39764f08d2b051e2b0c594f0c051111f7d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to potentially malicious or SEO-manipulated content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://exteractif.fr/pictures/2/11429386558.pdf In PDF document text
    • http://clairvoyantinfotech.com/demo/images/kofatopul.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/dabakenovejofozekesejuxub.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/lulusexiv.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/30413904316.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/refelikebutajuleves.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/96157776712.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/lixululafodegowulatuxek.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/pagivabu.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nanuv.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/vexenafodumadoxeleko.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4b07e6f759b4665d589592ce862ce65/veragovusiridotegegosal.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79456138624.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jemanutuzegifax.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc060ca47a---famimozupidapawakujalowi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b03bf2312---24549110155.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/mugorugu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210906053649.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210917_537F0E856348C3C9.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/83143418024.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/51810789264.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/34211882036.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/divuvuleparen.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210920_4891DAEDF339CE78.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+intelligent+investor+book+pdf+freePDF 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_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 10876 bytes
SHA-256: 810b993300292677c8db18f11801a1df9aa1d8569572103dda68e0e33a10e8bd
font_01_sfnt_off000143a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A7 18932 bytes
SHA-256: fba6939b7ba484648caf626b9e307b0563dcf69c70e16ac5a916b2349a1a3fce
font_02_sfnt_off00017522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1