Malicious PDF — malware analysis report

Static analysis result for SHA-256 30aa93b0fab13929…

MALICIOUS

PDF

72.9 KB Created: 2021-08-31 19:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cef7d6aed636617e602e9e6c5796583 SHA-1: 85f37aba06302ebd77f322a0b85c8be916748b6c SHA-256: 30aa93b0fab139293ab93f2a8138d73452d17a87917aa55409af0b8e5db4f00f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress upload storage, identified by heuristics as a "PDF SEO DISPOSABLE LINK FARM". The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded URLs point to various PDF files hosted on potentially compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf855702609---vuvew.pdf In PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46742112388.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/67147035261110a855034b.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b8407dea4f7104702b30c047cdcadc7b/56590468837.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/lilolawegofifobilezaweto.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/dudixurelir.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607149b335960---tuvumepekaponugutelenos.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/22359963432.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/jobixobuvunozi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/xewimefusorutoj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/drghmmlh0ge7k8uv6rdm2atl2d/76176936946.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dijogigomusuj.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/98066596135.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/76650665737.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed1244967---9604883354.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/kapubo.pdfIn PDF document text
    • http://classtool.info/upload/files/demelegi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/tezogiwife.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/keled.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/38102959380.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vavekekozuxev.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56174af0e4---figabatamadunafixabowuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=another+word+for+areaPDF 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_off0000bd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD89 16452 bytes
SHA-256: 08128225a5cec27be9876dd81d025a30498625fa62d9047b2466d049e1b34760
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10212 bytes
SHA-256: 8737e459db3d5402ae035c446cf08be247f4bfbecd27d19520b6e3cdd992e0ce
font_02_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1