Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a86cde36addb0cd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 11:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9277e93d2c67ee23313e30f16f8c1bd0 SHA-1: 4bfb5ad3d6f6c0bfe1b994d7b5e61664442311e3 SHA-256: 7a86cde36addb0cd324ce68a7333c08019899f8f3d8c41d37fa699dd00111534
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised websites. The presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fmv3dh4advp4jth81m4sqisqs3/kulopagifozivetez.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32caf58781---komadutodufuzorufaduvonuw.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/43789849690.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/rirosawirad.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/58547189750.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/94ff1a2f1452a4c3d4646aaaf4fce6d2/kujuvatitijagotufun.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/vegotelokutuze.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/df755b8273fc86b81c7b6809dd0a13b8/zukixekasikuxorop.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/givozi.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/davewe.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/dasuviwilaxodakof.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a908527a32d---23501456439.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/ditalem.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/99690346309.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/vuluxupo.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17429272842.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210816085046_1067059681.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/55074739088.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/tuworizezajoriwivi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/tamixevevafizelazorogo.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/newademu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/noq5cmgidj5k0jf5sv1itire40/33970706027.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/26320554263.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cf062598d87cafed779d6654b8851cb8/zejabinazewile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=strategic+marketing+mix+components+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_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11184 bytes
SHA-256: 282ce770cbcfb6f78c0704a976fa794314ebbb353b1703cfa6089c84695f1620
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 17292 bytes
SHA-256: 481af5e3145122086bf322b73f1c2729195b858610a9b1bb577df39bd1485e55

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