Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d830c424236997…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 08:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78d919a2b5768d229d598f675a6578bd SHA-1: cd31bfe433b188563c5b0d2cb6fe952cd3a3e685 SHA-256: 04d830c424236997f50c6db67f58076d8e543ea70a28384a2eb789cc51bb3b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. Heuristics suggest it's a phishing or malware distribution lure, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. While no scripts were directly extracted, the nature of the links and the ML classification strongly suggest malicious intent. The file likely serves as an initial entry point via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4ffc2eb760f4afb353e209c61cf10f74/55813605757.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a7d3346---jutokozumezo.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e95bf99cc4---5011017658.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811f1c93cc6---30294189821.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/95fbce14a56384ea9e4673b255ffd730/fevuwitoremin.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/dapakuxazif.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/tonanimaliwixegepof.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/jovulelutuweri.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff391e0a91---laradatalo.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/64255184855.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/40f5fa25f9a9edc90550bb2768355672/39841247158.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec16edfa81ebca1c4f85b89dcc109ecc/jafeponixekedipametufup.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/24276399121.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/75115595809.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/87020056281.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad80a9e9d---78457118676.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/16576632890.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/lumagowoxawari.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5807e527eb---xegijakipumedejet.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/15812064068.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/90252789705.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/joxotu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xuweti.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/25791820685.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/94260053117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=contract+lifecycle+management+pdfPDF 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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 10940 bytes
SHA-256: 8cecb2bbcec926f95c99ffd505e3892e70612acbd14da35f790fa847125dfcbd
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 14932 bytes
SHA-256: d38b5f6075fc6d80750d4c919ced4fd2eaf76e70efb49dc09f5a0464dec610ac
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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