Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e03af33610c3a5c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-08 14:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e596be124009f77d74defa30d6c2817 SHA-1: 06d5f42797a3b85b4ce950bebdee42b41a848a42 SHA-256: 4e03af33610c3a5ccb86c4f2cf799c7754cc55d3adae1a7600282525dc52a9a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the analysis relies on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdf In PDF document text
    • https://natatourism.com/userfiles/files/jokifapasoxurag.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/51106879042.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/18822560072.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/guputirepunage.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/63932128382.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/romupubesuxujujavugex.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/28178396378.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d567d452---43307220963.pdfIn PDF document text
    • http://ssp.by/var/upload/bupegubu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643a33618d---44618201321.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/16384531208.pdfIn PDF document text
    • https://el-tall.pl/pics/file/33258676943.pdfIn PDF document text
    • https://t2sc.me/userfiles/xuxotolavabi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369a6e95773---80830740309.pdfIn PDF document text
    • http://kasargod.net/uploads/file/87566088476.pdfIn PDF document text
    • http://scpt.it/userfiles/files/73346391325.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/32841763097.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/duwizudakojubudaku.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/419231602511630711761.pdfIn PDF document text
    • http://www.centralperdana.com/file/sivubaxasusitu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/68773743843.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/adc99c5ce97224d939995faa488c53e7/79551799496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=skyrim+risk+rules+pdfPDF 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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10556 bytes
SHA-256: 506d4326e0f3552e6e05e347ba760ce1937733d6fb2a5de094e794a9e3d63db3
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 19596 bytes
SHA-256: 202100519eadc39270bd65a7c04b1ac4f57445c1013e2a0657f7a816e638d949
font_02_sfnt_off0001397b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1