Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7d48b80d9cc7f7…

MALICIOUS

PDF

98.3 KB Created: 2021-09-01 00:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28d6f0cf89440f21d24df0fe54d2a595 SHA-1: 6631e0e3ba5fc7465a9f92a11ab9eaa001b04c89 SHA-256: bf7d48b80d9cc7f7e88ccf08783cd58b104f95f6dd6af24b88f661a7ccf6b092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mklaassen.nl/images/file/59563694828.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/medukinoxesizupa.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/tulizidevururifevotozux.pdfIn PDF document text
    • http://potya.com/jodumugapedotada.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160741854eb4fb---95980788757.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/busepu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pebujebazuwolufuv.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8430f430---43633591113.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/zazemezepe.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083455492052---1823329016.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/d00ef7fd9547e556b54948b4b1a32f0b/nuzevazum.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0d021bb---20892379768.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/muxidapenu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0a56fb471eccaa688018890f83e65c92/81986898653.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64be646478---nojoso.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/72378738842.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/wuladeb.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792647d6d88---nedisibujekizagotulizi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/29f71c65161e9708f0a64470e0bd1130/pesibimazofazanetotuwe.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/xetumozi.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rixokuje.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/bilofefizi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210828152948.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/45073564784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=write+something+about+yourselfPDF 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_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 11008 bytes
SHA-256: 35edd6317fd75ae685265284077520d2edf6373206c59aa4921faa1975968944
font_01_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001474f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474F 20104 bytes
SHA-256: c1c52bb637cddd499483d73dd3f4e246f95879ce787a8803f6197f75a0bb0630

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