Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca482053390731f8…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 10:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfa126378c329415db2cd11c825ea79f SHA-1: e54cd22511084c8cff13c7dc3398770c2d47b03d SHA-256: ca482053390731f84f11d89bef7365548889ae9598c5380c75b839d93d02bf0b
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple distinct hosts and the use of form-builder upload directories suggest an attempt to obscure the true destination and leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7800

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 https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/246768a785573dabe6a43466722923c1/puwosimasowubakeg.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7358a8730---17860053867.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c51ccae7---figurivezavupuxajuxixux.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080447154a2c---wenimim.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1371c8f933---2439543675.pdfIn PDF document text
    • http://roocenter.ru/upload/file/90280366312.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075bcae4030b---23501442090.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83902344024.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/7610477625.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19577f3e5c---rafowejazisap.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k65akd0q5lfgeuc8fec4mfi9j2/54352802354.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/28359942263.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/wefozatakusofugov.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/ruvukeposofotoz.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/fabolifokedurevi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad3e576d676cda216650e04597434bba/fidiragadepodad.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/vs0tqu45ktqatb4rp4s9f7uo94/farolavabimufup.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/o2ogdid4pkrlgh42ub65i1kbcn/vubibofakodulomit.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/bewapibukuvad.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b944859d9---11055239995.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087612c94ef5---79329552889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=23+march+1931+shaheed+mp3+song+pkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 18028 bytes
SHA-256: 9457b1071c9c13f7c19286f3ee9de4a32d9911d8ec134f69c10bae1d88dedede

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