Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d9fcf1320be7c0…

MALICIOUS

PDF

83.2 KB Created: 2021-06-20 18:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bcce993ab7b865cc7038151ff5b075f7 SHA-1: e9e9dd7f32a01c64e08c7416452ace9af170793e SHA-256: 06d9fcf1320be7c0a6faef4a859cd0cf643b56ca42f87278325150dde73e551b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, likely intended to host and distribute further malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://makesomenoise.hu/upload/file/38190507782.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4cs6an65emcilije7pnf48s1ap/10843958810.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/80062064639.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0360d952---vajezetixo.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/64239748501.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/48358499247.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c5041d6616e8166267ff693bcec782f8/kawoxutefurinidibeso.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378842792a---63618020716.pdfIn PDF document text
    • https://ekransamara.ru/files/84723245512.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080955c87fe9---guxigavogegufanu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160790ad6e6ec7---95565510892.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fd0212ee9e08da650a078ea53df9107c/97190640166.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1da9453615---43071617684.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/masulewulawibuzif.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/15852190443.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092374f60b77---taxikotesedimejoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sherlock+holmes+2+in+tamilPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 6428 bytes
SHA-256: 700e412622ea1c3e77c66a6f752f233a157dd24c0bd9349bdf859a6ac01d6195
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 5336 bytes
SHA-256: 65b6395d3f600df517dead2a71aeab5c89263d138832ed58490109c049ed0699
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 3784 bytes
SHA-256: 4b399cc041555e56aedc3006268a1df079844c2d9366d26a517aaaec71ea50b4
font_03_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 11168 bytes
SHA-256: 46e9a5a45f53045e4830c54b13928c7314e1fbc8028b485aeab9044c5512eff5
font_04_sfnt_off0001293f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16144 bytes
SHA-256: aa1464b36b52ac156dd3ea04bc30a94b8376eaa6838293fad627926ea8981a5c

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