Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd6a325f9d87ab5…

MALICIOUS

PDF

84.1 KB Created: 2021-07-19 04:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0899d0c007c1b5566b6f6d3e2343208 SHA-1: 647e9053b6565512903360b2d18a349c20ce9160 SHA-256: 4bd6a325f9d87ab57f3ed7ecfd8e1d7d70427db2e4547b57cbfc90b947e80ee7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gvum0s2tbvcfsu7qthg1jalqjf/17653532325.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/jazuvipika.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/34394586547.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16083c714ef7cc---jobaxunixisisisujuxif.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88068f79e---82789173716.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b867bdec538---voxekovatepinixenuk.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a900ccb89---73953129844.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/28904391554.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0f66a593---93522948979.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qbp340tulmpttjnol2q7hebkkl/jogokajupulofumanedurut.pdfIn PDF document text
    • https://flyags.com/editorResources/file///60236775935.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c7846c11---58652522911.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/25417995000.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f42fa600a0c---99006773026.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/953e8488f34188337f89d0b30daf7dac/41201036733.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9f3e06c---41879432978.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/18290449570.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/89906367554.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/8285704459.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/rivenujerumolutodefezutew.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xovisafebufuvewimul.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lilizedazewufoluk.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c64558236730afa3944d0b18516347b8/vamodezukumidapi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/62273607464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=add+comments+in+pdf+onlinePDF 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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 10500 bytes
SHA-256: aba92157b2cfa66099b01f44eaf8a2fc5e8f592bab5ed985c2812c372bd52cc9
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 17212 bytes
SHA-256: aa15908b37f1e2b03682f07868cb5e1e6ba03e059136913e8647f03f5e52b6b6
font_02_sfnt_off00012b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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