Malicious PDF — malware analysis report

Static analysis result for SHA-256 898d3e0676173562…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 14:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3fe0dd2ce7969018f3c1e4ae91e6771 SHA-1: f196cad383d2353511a50066cf579bda4410b357 SHA-256: 898d3e0676173562053ade18d29e08d1ac49f5d3ff550976d11f4b1842cfc8d4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://crysiq.ru/uplcv?utm_term=can+you+recover+data+after+factory+reset
    • http://zhxndl.com/uploadfiles/files/golodanisegu.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ae6306e3---dujozu.pdf
    • http://fotografieindex.nl/images/uploads/10009040554.pdf
    • http://mishelik.ru/userfiles/file/41240880611.pdf
    • http://mya1fc.com/files/ckuploads/files/41250798185.pdf
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/99928323810.pdf
    • http://hotelgiottotorino.com/userfiles/files/kigupobewidafisag.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/nobetuzukifidasogoxuxawi.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i13qm5co4315ksuj5onfv2gjmi/90171930654.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcc72dab0272de1e0b3c55b2ee5c8fa3/nebiro.pdf
    • http://seosanhrd.com/userfiles/file/22369385890.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/509451a25601b28c3ff969ff72810ebf/8384514447.pdf
    • http://namngonviet.com/user-/files/59531090653.pdf
    • http://zulassungsdienst4you.de/bilder/file/25873855926.pdf
    • http://cuspsurgeons.com/userfiles/file/12291602924.pdf
    • http://digitalpolicycouncil.org/imagenes/file/panuku.pdf
    • http://veterinariacasettamattei.it/userfiles/files/guruwitepegalowobumabe.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/79298340194.pdf
    • http://mskabel.cz/UserFiles/File/koporilugakizisaxupubaniz.pdf
    • https://stvorki.ru/files/file/zasunabodozoleroriridadoz.pdf
    • http://jinshi66.com/uploadfiles/files/piwofibenupajux.pdf
    • http://jonme.net/ckupload/files/sexatarujovupataliluli.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c6d25b76a0bba27a8ee91004d9669ddb/5901031005.pdf
    • http://aci-immobilier-douai.fr/userfiles/files/visalawesikovad.pdf
    • 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_off0000cd5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 16792 bytes
font_01_sfnt_off0000e574.bin
b967d1932caa3db4a20e0723b3f6f155356cc59742d804ea81b23a1f34536a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 10644 bytes
font_02_sfnt_off0000fe0d.bin
a2f1008080854134227f105ed1b1c991caea2840db7c81da6c284cee6f0cf3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16728 bytes