Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b8a613879cd359…

MALICIOUS

PDF

80.0 KB Created: 2021-06-17 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d524ec1004b21bf1dafc13b98500ad56 SHA-1: 628831e4a2b79e3b433e39e2fc0776e91fadccb7 SHA-256: 75b8a613879cd359b26344f0ca003ad6f221064196127d58256ba68c0846a328
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The document's content and metadata indicate it is masquerading as a download for 'Xf autodesk 2018', a common lure. Although no scripts were explicitly extracted, the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, combined with the ML classifier and ClamAV detection, strongly indicates malicious intent.

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://coretry.ru/uplcv?utm_term=xf+autodesk+2018 PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1df65168020148fb5a7a03175c6b1cd2/xugalen.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bead169489f88bf0612c1c798cbaa2c8/mibivipa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1930b7803b---zaxolekisewobexazaden.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/33481624227.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504094949785664.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cg72t7i4qeocsr8sj26kv6g9a4/16975724501.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c379220eb---panogovetaxezusezone.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf8012d---94494531042.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65347de21a---gufidotamidugesalegivitim.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/24100145827.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072d0cdacdbd---xitamebezen.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0185d091f437d30e9cf224d0e637f855/dagekiligajowo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d1691a2---nemazelusalugetu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210608185653.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1passp3lh92ijkjmocunckr81t/vabetezepot.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/703cfea48b827178c4cc10ee60d3f13c/sabapikola.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083179c93471---9228452303.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfa767d59---tekuzasunuvusefakalomazud.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c525b2720071c3cb33c39cfd819d41e/3387447174.pdfIn PDF document text
    • http://fancli.com/19ljarIn 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_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 5332 bytes
SHA-256: d0e1317e36fa8d04893547747303cb09810fed13e351b57bac9269bdf7da7934
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 20148 bytes
SHA-256: fdafb652138753ddbe263121c539f73badabc1fce4f6360d2d83ffad60578985

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