Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc9c78c31e9f87b…

MALICIOUS

PDF

88.4 KB Created: 2021-08-11 00:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16c4b53e7a72a35159b24040c0d739a0 SHA-1: 6382780a00f6a15e130b6954a6bca020af4f65e5 SHA-256: 6cc9c78c31e9f87b361d4ad133237d7dafce73655a59f8c89b932fe73c1ff30b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/k6974d9ucm9v52o4shdtq5u6ts/3118515704.pdf In PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gizotidojovipawedufudiraz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/27c9n9594fjebhuspisn87in96/jokulek.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b650a52b3ce---texukewexir.pdfIn PDF document text
    • https://saam.vn/images/content/file/pobirutafux.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9v5ncsuo4tfj9oahfqtj84fc33/wovorajerafubiji.pdfIn PDF document text
    • http://k1a.ru/images/files/file/zexebemorufupogusasip.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/35076855541.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3da3fccf57---92671413984.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/12200867208.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/latubuteguvit.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/787e31f4da520792ee7bc1cceccc416e/viloj.pdfIn PDF document text
    • http://kccmaul.com/files/files/21034879759.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/25093107089.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31c7b7d9e0---17372849349.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e2a42864---13622199153.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/tifadodo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad714783649---1524093166.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/30836384496.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/fomiri.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/kezirikitoxexuwuzabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+the+bible+in+chronological+orderPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16852 bytes
SHA-256: e05eb83f476e2cc120cef67a2d58ef0e38cb0597fc14a0de8ba35dadf667b60c
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A28 10740 bytes
SHA-256: 2dae7d3244242f51750d09b8e30acae1033744b91518dbcaf1c03092ebbac2cf

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