Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe365c681b5e0e23…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 13:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb51177209dbfcd754fa747944d16629 SHA-1: 4ec6b5b103fa4b24594e8a00c303d8f6f13039ab SHA-256: fe365c681b5e0e23985b48229ef73df72f6ece796f26ab4f4e7c2cf980e7eae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics show the PDF hosts a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r23pq79m1ehte5f7peeffgm3cl/vipowupuvazon.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fokaxerunugunugaxupur.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/63693254153.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0l6g3ka9vll0cvihucqgu2gvsp/vevuvazifegapezoviwefuwet.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zerifozofofazomolaroze.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6fa512af9b839ca42b5b0305a66e6ce4/resasoxeruxilekojefeb.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/54t1kl43qaqt9ipmf4076ln51v/pukoreboxakabimugus.pdfIn PDF document text
    • http://slsnn.ru/content/file/6924281707.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0ddd620f---rujutonezajuvase.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1f00f66f---73018599128.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c5a01fef4---lupakumiruridizagebibopab.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160778694b51ad---16635396166.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3u0fus55t87jnrs0i5m63qn2qp/4335891716.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/telamujevu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/5610713941.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/jaliga.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/29986948456.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/26412188946.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/718mo7hjn82smb9af77mh6d8j7/10955168431.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56c50e3d09---tejuzixetopodix.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a2184b02---69075996118.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/poa6mh1nld08lh2ks61o31jhv3/64347188355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=be+my+baby+drummerPDF 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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 10188 bytes
SHA-256: be9b12bb5e7ddc497cb81f2fa3f6a6276d296a4f62fbc012e00b1d33368bee0a
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16364 bytes
SHA-256: 4b9484cdbec521f1f6b5b7e67e37ae58f908b3710559697866068f0fa7de562b

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