Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7aaf8ad1877cab…

MALICIOUS

PDF

98.0 KB Created: 2021-07-23 16:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8d7d84a51ebdafff290bd5da23e64b0 SHA-1: 00b9d49ab154cadb7d8c45678d1424c4a1b7f0dc SHA-256: 8e7aaf8ad1877cabbf6e22beb15f5ad1c1f949dc39f19ca1ac713091c9642ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tobywells.org/media/fckdir/file/fadokititiralifelaj.pdf In PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • http://chayka-svg.ru/files/50496072510.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/nofuf.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9b22f72cfcde2d275d5f21eb344b0e9b/dijavuf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab359135a---mamifaxivena.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/woralisixo.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/26228492771.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/llmmeeiss72mn8antp4rsc0035/jotekefebotoz.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/65106594152.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/96597316401.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/neworilesilumuxugoro.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff94f2e14f---97814078262.pdfIn PDF document text
    • https://ptogel2.com/contents//files/kigevipanogadibofut.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/93359919394.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/72873362835.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/62779773301.pdfIn PDF document text
    • http://lulanjina.net/upload/files/sidikubowenid.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6921a3ae---vatozetur.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/90914613386.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/be9688108c165bf39ee395db60422c74/jopubuliluvaz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba45e2f9de---99412819365.pdfIn PDF document text
    • https://premium-house.uz/images/file/52441169370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bmw+e39+540i+automatic+transmissionPDF 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_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 11260 bytes
SHA-256: b7059d179058b92df4f4e4b7d9ec2e001c02c46a79b7340d2851d45a58be47fa
font_02_sfnt_off0001444f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 20664 bytes
SHA-256: 7df6ce0f29403e5568abf0ea91de18bc9616efa615d71ed15a2a02ab1bdbb3c3

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