Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc52fe285333424…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 08:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f45d52ae42fd6065e8634529bc10d9c SHA-1: 80d4b143e3cbb3a9fda6a3b57cdd12b7c3b1924b SHA-256: 0fc52fe28533342474e430f1c3679235bb81958df14c1b59220682e5d77e7ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to various compromised or disposable hosting sites, some of which are disguised as file downloads. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cncunse.com/d/files/56028032916.pdf In PDF document text
    • http://hotelbasantresidency.com/uploads/94147287569.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xikosopepojunole.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a558d7f3---20852928686.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mefulomi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/83945014613.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161371b905d702---kifeximojitatazaxixadafon.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/011825589203.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dezarojunixaruwewetona.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca11950b9---motewazuzubij.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/19140525589.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sidojavomogu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea2d8bb7c---zakizuronexojikinib.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/lexinepamurolir.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911205232-kusugerazofinod.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/58043163593.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_53F5C08BC86AC1AE.pdfIn PDF document text
    • http://carszana.com/image/upload/File/48570544962.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a2ea4d1ba79cb3ff54f47ec0edd1a20b/wexemapizugigupamub.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/midadidesinojarukijazab.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3583dfef---wanav.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/voxomomopukil.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3770158ccfd6fdf8a631e62e65955743/zasovizinip.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9ee6816cf1833d43b19796d814c018f7/jokujexejir.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/40409182513.pdfIn PDF document text
    • http://someteme.com/archivos/_20210909115312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=euro+truck+download+apkPDF 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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 17652 bytes
SHA-256: 45e92eafb1a4ab6d4069b275a84876b64d5aa6c88352d5d6bd2898906a6d3d52
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 10376 bytes
SHA-256: e1c0aa81ad1069e3477887e051fa6d790c8f1b1febe5ef14cc0bbaa6ea858f7c

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