Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2a7e37304ea12d…

MALICIOUS

PDF

81.6 KB Created: 2021-08-17 20:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9ef16a53688fe1c50b020c2f4c92ae1 SHA-1: 14710954dabd91fb63ef74e695bb22a379a6cb48 SHA-256: ec2a7e37304ea12d57117effee3c28dcff116f337718fc51b0cc7f68bcb13570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, likely to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://stroisvias.ru/userfiles/file/32190434682.pdf In PDF document text
    • http://humanitool.ru/userfiles/file/99420713009.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/40459442420.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052007222958.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a53ccb321084cba3af18a8611936b306/wizumilijiw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/21714915b7b21bf3055233ac48adeb8d/31271097334.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/83989947520.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e1f62a5b---28699984882.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160701a21b9390---wumasakejuvanaripegis.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c438fe8fb83---12584427663.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/lezuzuk.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ln9505f1uu7u2hlqloj9qrlcau/82326967924.pdfIn PDF document text
    • http://ipublicity.cz/data/file/donowibawotakikopurufo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/be5364e358e4e6ed845f4a61a8b0b5d3/48317405274.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/xakovitalodaxedazisowefe.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/57118943841.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/84477d464bbf8bcff9005a7617da9369/pufufedamezivelodura.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d061004a9a---34140354690.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/gigubaxixudijani.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6760109557---57940606356.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/dovin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=punjab+text+book+biology+class+11+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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 11424 bytes
SHA-256: d889953072d862f23a8a42ffb0ef602911bba64901a850b0fdb78a43c2cb61e6
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17288 bytes
SHA-256: 5f01a7a0d420ddf63e85cde18dc6c821d28da5b0498d76af8b76a4287a0cd4ad
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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