Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6c00ba1d34b9d7…

MALICIOUS

PDF

77.8 KB Created: 2021-06-11 02:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2e62cd2c73b139e83de4393fda285694 SHA-1: df1a90bf993b7e80d2a6615ae727b0ed9b4f9316 SHA-256: 7b6c00ba1d34b9d78411a23a871e013e4e0ee9acf8d035caa23a279993300298
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically employing a 'Browser Install Lure' to trick users into installing malicious browser extensions or updates. The presence of numerous external URIs, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a social engineering attack designed to compromise user systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=mp4+to+wav+online+converter PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c35bdb2ffce1388978bd52d3777702e2/50285054230.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb01664668---1017687115.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a8a892ed0233463bf35e5c2f71acd6a1/70006264233.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/migida.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gafuforesagapivetadewov.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/riruwexafemowoli.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/457f5dacb122cc65c8c5a708eeb6c197/87899128878.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3e18823c---70629085420.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/70025010ce37160834cc3e20d7f8f3c4/38387834464.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/amv0o3bnralv4rv3vkg6vd2148/nefafalakuwudam.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8pc2idfg00qlnt7h9rlvr1aqcb/zuxilaxiwesunuratanogabe.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/juvisugamif.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c12f1b6de2d---36356032103.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vubajapopalosurej.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ac33171bf7e0052bcdf268c2cb3f1bbb/26225957915.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1d23jjdrk8ji4rj3ok7ab7pih0/nuwuvalufujoxazori.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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 4996 bytes
SHA-256: f8dab75a9ce4ce6369a8964950a0f65a9c5ef6c52467cf75bed58a21cc7942e5
font_01_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10880 bytes
SHA-256: b73fa322c30e899becc74109b782ca46e3b45fa946b9ed83c98584d6ae140100

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