Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d8a6b7b7999eff…

MALICIOUS

PDF

75.9 KB Created: 2021-06-23 22:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9dfc46c9a302fb89d604104d6fa426ec SHA-1: d4f75ac92f7ca88bf26d0a32f0a1ac72743e4a27 SHA-256: 19d8a6b7b7999eff758b887f0136668e50d700779600fb5ec31f6d7489eff05f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=flymaster+nav+manual PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/makumoluzojos.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210621073526.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/34089309806.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/jeforaxuxixixotawofiru.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c6f55d1a---muxoranus.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/40733102233.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/lewivolitumonasezijul.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/79106149718.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0853f341a---nemarulatesuxemotiwax.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604101129372729.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210529_4233E4CEE06FCA95.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607941b3ee33e---45951487817.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/rodide.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 4948 bytes
SHA-256: f91a8ed2b3b23798e51838c28536028697719e7c3bda65f68aa7a3fc3e5e3bdb
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 15208 bytes
SHA-256: 8c157c635c7728e6a86fab4950851db18ad072dc58096a8f088f4898a1768e4a

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