Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa73359c864bd64…

MALICIOUS

PDF

92.1 KB Created: 2021-07-14 08:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 669d606153402d09bd5e1b3f1355e454 SHA-1: 9e8c72b5b794fd8f48713072ec2c8b927f8dcd84 SHA-256: 9fa73359c864bd6490b38e7b4cc64f138dabc6834e8affba50e624ebe6bd406d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's used for SEO manipulation or to distribute further malicious content. The presence of multiple external URIs and the link farm structure are key indicators of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://chcial.ru/uplcv?utm_term=how+to+find+unit+vector+formula PDF link annotation
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/4rc1jq6hhc74unsd078teph7l3/galusogikugozikurig.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/97719055534.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ti3pgaptn5budtnba6jkitvvt5/duduxezaw.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210625195741.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fafej.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/jadebalimawisozifuluvubi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a996ab6f521---xopaxebotuzukimijusade.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tepeperir.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/884c2f1d3685f36f22a64891190fa4fa/18369074700.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/narugawawewaledoji.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jadogudateramuwo.pdfIn PDF document text
    • http://4bx.pl/public/file/nekimajarujijujurero.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0259a6ba6e730382a8d2b3f339df3a62/pigesilekezelukiwe.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/likolel.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/16306674278.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/4ds9fssrt23mf58cs7on5k4trq/9865899457.pdfIn PDF document text
    • http://arslanemlak.com/E/file/64153108633.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5f774b31---fagorafujexuxu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3581fb998e---78627315851.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/dilifij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f79k0jn8rab1qhn7hhilo1c29n/81414805647.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2dd08a7f---mowaxavok.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7a8515c6---17789446700.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/76463854066ae049aea2aabbdaed8167/rakodetojo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 16076 bytes
SHA-256: c49465b94fe86b96ca820c65ff354120e534cda7b3173055630da28bac13411d
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 10712 bytes
SHA-256: 46023f191fec439dd968d50ef7c928850d076ad2d6d1670dd2794bcc3b055d76
font_03_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 18964 bytes
SHA-256: 106305996ecccdf6f0d058740f97f935533c5fa5118afb57e66131ce730a3e55

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