Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdb92ad8cbdc697…

MALICIOUS

PDF

132.2 KB Created: 2021-09-05 11:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 789638f47cada7bd2a1668c8824b5075 SHA-1: 1d52b36fdb6fe9a1e050026313ba1d958d7227ca SHA-256: cfdb92ad8cbdc697a3e8954d1e50baeaae64e57b3f0cb20aafef982b5970e33b
156 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 0.9963

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://oniceh.ru/uplcv?utm_term=ppl+flight+training+manual+pdf PDF link annotation
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/32244763642.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kutilibazulopaxezozewux.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/324de366e449327db2db4920fc2ec7f6/lifixifeb.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/80857163404.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3sgcsghttr29p22e77u9pars00/lazemovizelerizomolalo.pdfIn PDF document text
    • https://luminex.pl/upload/file/xokizijim.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c281ec93ce1---wodasuram.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8ca2969c9---9612589282.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/26bdd520c6ee21e6ccc89eb3f525072e/pajumasevotufijuli.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/risasowi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ecc3ebed50ed87cef0744d4a70351923/nipezuzunodifikim.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084123be5de7---pimesosav.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/kiwefusuduwu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/40c937b49e06be7980e5e3efb6583187/79440426908.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/20339387780.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/vidamiwuvitupuwu.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/jasajadafusexulupitije.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/346df9522cb6f5849b5dc4f3e04a5e5b/17427730912.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/3b14d5e0363a2a2017f56141c1548bde/taxopig.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/21745057728.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04f29119c7---lazoxirojavarufikobejadi.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_off0001a3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3D0 10628 bytes
SHA-256: c60cb5ca7ef75d0a874406b0235a508fdfc1bd387f0c366c3345b205afb7ac42
font_01_sfnt_off0001bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB99 18252 bytes
SHA-256: d5b11d8b2ceb5d2c41cf6b6d3c1420e680bdfdb8e556025dc814e8eab93f026f
font_02_sfnt_off0001eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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