Malicious PDF — malware analysis report

Static analysis result for SHA-256 e488ca7d5d4e841e…

MALICIOUS

PDF

350.6 KB Created: 2021-08-15 00:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 112fe754d66263d158367010660d2f0a SHA-1: 5262e39c2c4a35691e4b36db9a614630ccd10d15 SHA-256: e488ca7d5d4e841e2f1607918ccb82f1e153450c92a9d62fa9aefca487cc773a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9084

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=voc%C3%AA+nasceu+rico+pdf+gr%C3%A1tis PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf06f69076---pixekemodubuzoborutuz.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/goxorid.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074917c58583---tixarijilesazomodimuf.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/47469023052.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a039004e3bfcc3718b0ce57e239a76aa/78919298318.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36772ef4c6---ranokipolozasepewafenef.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a8fb3e2cee69bc773269540b98a5cbd7/tadizevasexawiw.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc591e21c92---megezotimutimizeliwene.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b40abe4a955---xorunonexujibekamokexegav.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/safipijoxosakunuwabotu.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/57740565852.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d84970c6dd8---galajuvedavax.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c67cb2d4c---medurelatasefetik.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/11398376457.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/76723396050.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68095064765.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ca8e751d---zexeku.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/bobevif.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8059f1952e---sexunelukobawafij.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad8e8534---66815015219.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/giniv.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/87140757055.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114ab731fdb4---34566222605.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jeset.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/67737010111.pdfIn PDF document text
    • 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_off000502b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502B8 11156 bytes
SHA-256: 8b0439f482608a3fd9564d25cfd6526dd9ded23006ac0fe1c2f3cca2d9f3b118
font_01_sfnt_off00051c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C16 21152 bytes
SHA-256: 142d29f2ae2707b24dcb67d1d3aecfabe8ca3da1d59553dca12c1e3f2698de19
font_02_sfnt_off00055097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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