Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c894175fddbce20…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 04:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c044755ee30b1f80fcc6a357ad21939 SHA-1: 524d09b582e25e23ea4ee7501dc094b379c84ea2 SHA-256: 3c894175fddbce20a31065b6e17212f13bf4509bf6639aa6782324e078bd895d
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 other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using compromised infrastructure for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92077f3781---78312743841.pdf In PDF document text
    • http://nhs1980alumni.com/clients/878257/File/lukeruranurerufetada.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/68476001647.pdfIn PDF document text
    • https://congchung7.com/upload/file/rekoxipugotejakeneguluwu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sq00qo52thldonp7gm0nme29a3/jaduponipufivur.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4601c3739---23338173849.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27c9a2603---dorupapamegudefimog.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e23fca35f---49033224720.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uvj8i7hkgs1k7ruu91r8eb5fvk/76275752682.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa168c74e11---garosowogexujite.pdfIn PDF document text
    • https://paperland.bg/uploads/file/nevukuxanubaxuz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609831e47fc1d---kojajojoxesezexe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ngqofmq1bm8p5h4ll7kbungf2a/bagufasekup.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/lebugixevipasuz.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210609_5D69692154C7525C.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/064ca505e714cf7c2a8750ecf69ccd31/80448575825.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/pixipetazovufor.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/55915502996.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/vidulorisala.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1e6388448---99516814589.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/dujevovinojare.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2fe83a0f---wejos.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959b910c8a5---dumezatimilitopifitefevoz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/09a0d49feb7f63da857be607da29c5bf/lagafagixelupajemexatoni.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/3513134971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=science+prac+report+examplePDF 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_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 10544 bytes
SHA-256: 3186a719a37134f9c2651384581a353f910de59bd0b7e13f2d7498db34290aa2
font_01_sfnt_off000125c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C7 17168 bytes
SHA-256: 6aabe3a95b996f010f8fcad139a275d1aa2cb9f6d22e09df0e9be91c7da6c242
font_02_sfnt_off000151d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1