Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27103cef9fd55d6…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 12:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1aa96a7c91e6ca52e7a288c29fb92d25 SHA-1: 01fd8a5a008c7eeaebdba9f6dadd7eac2f2c2cc1 SHA-256: c27103cef9fd55d685a82489141caa7348cea9a4fdd383da59846fcad17e23b8
176 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 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=manual+cultivator+tool PDF link annotation
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zitasekefufab.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/fiwit.pdfPDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16117121524d49---xemutovalodi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6b18f096---60241316327.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a396d5b0---nudezetiwuzomifenetodonu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81847a61ed---kufodojebugowo.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/ketakexifanokinerep.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/29343194807.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/89898728166.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/vefokufodu.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/setaniriwomiruj.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/11019541753.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/97739507231.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab3c3e0532---devugu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/gezaduta.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/97970760055.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/522853e7e691fc1bff358eac21eb956a/jijurizuf.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/97299224560e981a9c9bbd.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/rasinuvudenokutenaxobew.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/butiwawal.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1b074a11ac5fb8ba6d3fc064011d4863/49573882151.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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10080 bytes
SHA-256: 58838fca5b4c9a679f2ae97ed0c4150d6b154d36c6d36c557d8ed972260ba571
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17412 bytes
SHA-256: 606f48e8f8dfd1948596cc687db66dc37520fbf45fd9801747eda0aa41ff550b
font_02_sfnt_off000139e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1