Malicious PDF — malware analysis report

Static analysis result for SHA-256 454b49050df62c56…

MALICIOUS

PDF

64.0 KB Created: 2021-09-02 00:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3cd7fa45d5a93d4cb64d77b01f54455 SHA-1: 12581cd790b9b89ef0f1cc067354eabb0c39d97b SHA-256: 454b49050df62c565b690f34ce70b541fedee3fd8eeee71653269caa8d4fad27
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9364

Heuristics 5

  • 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
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611deb2642cfc---timatisegudexesamir.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8eagjjtpcc0lgcm15l62j64u14/tovejodavamuji.pdfIn PDF document text
    • https://istanajp2.com/contents//files/19922996016.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/saxibewafefaleto.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4efa2ac32---rigebesajokomawozotaj.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nefogonidek.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b683b72b537---sunekar.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/janato.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210902061805.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/70385839444.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ef115974f---9381409608.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/43722593074.pdfIn PDF document text
    • http://pronobile.de/catalog/file/mixelusogawimokinunipib.pdfIn PDF document text
    • https://ms02bet.net/contents//files/sepupemuzikikefubopatisa.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/86608704288.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/lodoji.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/siravewebojusukoda.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vomoduzadaluruvaxenuf.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/21676936967.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6ec671bc813d0a9b78725823fb9d67e1/meremejaduzutizefanudukoz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/grb4fpobkltasqa0qmvis097vc/gelodububoriw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kale3eeb94enei7e82jsl8vuoh/52864663070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=write+the+ohm%27s+lawPDF 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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10380 bytes
SHA-256: b030529963b3f0e9d75fb4e559792f33bae6eae0c23961a6c6ffd5891f43e156

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