Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b6e5659d4ff366…

MALICIOUS

PDF

95.5 KB Created: 2021-10-13 12:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 076660da65434e39b5e7018284afeb5d SHA-1: bec777caf56bfe23139c9819121a40420a9ba542 SHA-256: 18b6e5659d4ff366d115a80a620852abffc56a987cce428d82f7d3ff0b459046
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a likely phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bilalyapidekorasyon.com/userfiles/file/rorob.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/suvazalodigonuk.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140905a6e37b---zewinopefi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/nupazujesolijusog.pdfIn PDF document text
    • http://placc.info/up_image/78292898864.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/98a7e5ead4ebc3fdd9f09e9279f42fb7/rejikesajenubikogud.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/38921364144.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/wuxowisikuzurepimosex.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/kuxutenetewitegivapegojaf.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/givaso.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/fuligogi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c38c3885---53624226970.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/neresuzaluvebatilexo.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/liwubade.pdfIn PDF document text
    • http://belean.pl/userfiles/file/26145486257.pdfIn PDF document text
    • https://quizai.com/uploads/files/11150548450.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/40347893107.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/maxinebokot.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/levonufumezivetu.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/kalakobokijur.pdfIn PDF document text
    • http://blccy.com/userfiles/files/fawewej.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/viwosez.pdfIn PDF document text
    • http://kag.fr/userfiles/file/99146420642.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/patimewunasupi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=android+google+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_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10224 bytes
SHA-256: ac655473612d5339a3bfacdb7c5fe583bf9c86dfc3f3823eb91ebe3d91fdeeea
font_01_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 19232 bytes
SHA-256: 180d26d8cdabf0e7db3d110b2465d9103280948407010a39d09bbc8a835a9241
font_02_sfnt_off0001589d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1