Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4f4a08fc63ad13…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 17:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c500eff684e842481d814c0984878d42 SHA-1: 97245719d59ff2cc3a08e0dc0475c336d8cc2581 SHA-256: 6a4f4a08fc63ad132a03c076ffbaba62e35db022fce796d1fbe30606df8396ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://infrive.ru/uplcv?utm_term=comparaci%C3%B3n+de+alternativas+con+vidas+%C3%BAtiles+diferentes PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a679e442b9f---13663349560.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4363d5805---31003127100.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/85645988141.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e94a3c241b2---69488234009.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/61271533526.pdfIn PDF document text
    • http://gibisch.org/files/files/josagalalemulonigetirivo.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/75490505355.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19742b91d---70875326393.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/60614657023.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d84c9ca9---wagevone.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/m66b5528e6a2hhr3slb6kvo764/53166451449.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2665071d2a---sixuwumijazininodotiz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/59c7c6d296de7fe7af5bca6ed9a5ef09/lubegexasejasukono.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/97754493040.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6f02a5b9e0ed7b53fe1c905d771a9ac7/37771957680.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • https://stvorki.ru/files/file/tajafupexilabakisitutag.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/am0u5cbbr0benr3pmm5uge1mfq/77981717997.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/suzomakanezezedej.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/92348116178.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d823fa87---gonik.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_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 11132 bytes
SHA-256: c627ee7d9548573a4e17ec2b37eb0ce268796b09275b64b8d4468e04ae4e50a6
font_01_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 18496 bytes
SHA-256: 9987d86bb6693b16c22f48b91801e8b331019810ccf555c5b371995a883d90a8
font_02_sfnt_off00013ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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