Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66904ed402e9dfc…

MALICIOUS

PDF

72.2 KB Created: 2021-06-21 04:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ca15cb4b570a003892ebf87bd1759c94 SHA-1: 1f1041a6af82727de9e63e39afcf1ba52c0a34b5 SHA-256: a66904ed402e9dfc9dd5a4336c8924857613f4598231fedc7a84b5f8a574a1aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content on legitimate but compromised websites. The document body, though heavily obfuscated, appears to be a lure related to PDF manipulation, likely to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609444bed6c16---bepokudexegipobudexe.pdf In PDF document text
    • http://textingrights.com/userfiles/files/58478674843.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/76252633736.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5fbf91b973867c34e850911194652756/49425229611.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/reputelova.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/43057195732.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/n2oalf9l142855m8otojiai6e6/87275233725.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4007eafcb5---10102325086.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cb96c736294a9999ee5c6139827e9d8d/90942875562.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6a4gtpnj3bgeum5mk5e3s8lfaq/nofovim.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/bcf0872b13fbcd3c7fa1956cddace362/88806840301.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079c46153a57---98660207851.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6cvf73hu7498f4pr4rbctbotgg/bubefobepaduruguwujomu.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/40505458712.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/66165426671.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/lofezutoxuwixapewuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+two+separate+pdf+files+into+onePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5088 bytes
SHA-256: 4aba1740f14d1386eec0f445a33d00e26599d62132883238d30d712d13334583
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10600 bytes
SHA-256: 4622d190af9d54f63d3a4189cd0f606230dff4b9d2d9e30fe5ba881ae34b9840