Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c415bf421a5147…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 21:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05799179bb4f8bbdded1be2852d58d70 SHA-1: cc347d408e24bc010f90a25d380c04a3e64f8196 SHA-256: b2c415bf421a5147d98aa38b098457fc2e7be974f3ad49581c93b039ee751029
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This behavior is indicative of a link farm, often used for SEO poisoning or to distribute malicious content. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3e4658e5---61296665059.pdf In PDF document text
    • https://peterdegendt.be/file/13046147780.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/motiguleveg.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137b2dfd2904.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4eb658e71---vevuxogalexovekarum.pdfIn PDF document text
    • http://charivne.info/images/file/jorilosonejuzarulalas.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/63119766171.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4880a0a5---fopupax.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/44747329054.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/zutewuxedigafirurax.pdfIn PDF document text
    • http://snft.ro/media/file/26866931894.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902210340.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/binosibunevakiwafitufisu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a737e60397---11510381048.pdfIn PDF document text
    • http://ranch.pl/files/file/mimiloxunimo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/ninasuw.pdfIn PDF document text
    • http://calisnt.com/uploads/files/71965488430.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bumuwajoxebumirixejupa.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/zapojo.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/24703389269.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/xarukedomefadazejo.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/83690992087.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339dd5ef812---vigenivitenetidemawap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+drawing+programs+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10932 bytes
SHA-256: c778484a4b78a0622e1ee37d4a7ccda03ead4909870094e2e333011ab29e99c1
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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