Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f3f63126826801…

MALICIOUS

PDF

66.5 KB Created: 2021-09-14 18:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0d496b10528b854a41f289e22865c3f SHA-1: fd44f32b252022cd6c298a710c4f987a8f3f131d SHA-256: 19f3f6312682680114afe8fe0ee03f358a8239518d7e776fd777660ed329bb17
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the compromised hosting indicates a tactic to obscure the true destination and leverage potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed3680c2df---2981610157.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/19820135633.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/73011762046.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/65083701597.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludope.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/8239002146.pdfIn PDF document text
    • https://iohrp.org/f_files/files/77497603294.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/7510312422.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/81531467949.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/8114387787.pdfIn PDF document text
    • https://polaria.cz/images/file/68592373575.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/41083918529.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614083493ba3a---ruredamegogeropijun.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/80540417462.pdfIn PDF document text
    • http://friulanapanini.com/images/file/girufilaxopataw.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/wamokulomaxukenesesaxiwo.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/91746469503.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/32083844500.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/11685472286.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/gadeweli.pdfIn PDF document text
    • http://delve-cr.com/uploads/gisede.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a1427c4a---kitowesokefobajire.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/telesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+vampire+knight+season+1+episode+1+online+freePDF 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 11272 bytes
SHA-256: 3b4106556928f479349435c15e24f01905f33df528ddc0bff7e4938df59c947f