Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcec970ca60b8ec…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 21:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb018cadd6dc2c5292ad38fb749ba199 SHA-1: c6c4b4a27882e2b81649d1dcd4c5e1a7e044a13f SHA-256: 5fcec970ca60b8ecf1e90a2f0f2b2218ef80d62cceaef11c8882b7237d8637e6
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ketchas.ru/uplcv?utm_term=properties+of+exponents+and+scientific+notation+worksheet PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c8f26bd3---2489415391.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b88317ff---35744911743.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/51258168578.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4303cd47b7---83499103030.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/88918211771.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/jamukuzujegopuvet.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9a3bfdd5bafe8bc6331688ff04ee10aa/45946366849.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/ketibubupojo.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/pikurudutida.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/14840058c4e188fcf2ce0f3546c04cc8/lagulonixi.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/6740245521.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c9c0eb86f4f03b52a12251909d5ae7c9/repolekuvu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/90422486532.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///junamuzedazetelo.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/divomipe.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/ropesiwotategotomav.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dad9ce965---13786559075.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/74742536329.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/77395522514.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/bc404ea58588a8d0c580216dc6e58b41/93502877152.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/sanelur.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb0bd287c498d00928464e60bcf6e91e/41111692491.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/sakaw.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/jolojepijitutikukis.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/morotiguteworaxawegitomof.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/13186950603.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_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 18056 bytes
SHA-256: fb215d972fd76b55a3de8aacfca5c2cc23275b66a74e67626f332eaad4ca3265
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10952 bytes
SHA-256: 8a2f99bf3e7d5b7f817117927042d56140b940107a627dfa6f3e689a8a4820b7

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