Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08942c8d3ff9c3e…

MALICIOUS

PDF

77.8 KB Created: 2021-10-14 09:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fead1bd53d58e242a65b17778f221525 SHA-1: 6b5af0f2a5cd123a2c10d4a765d218f2c7b74b36 SHA-256: a08942c8d3ff9c3eec8b19a6b80c767bb10b9ab81e21c0a7fe3ac016f3c91248
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, several of which are hosted on compromised or disposable domains, indicating a likely attempt to lure users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

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 https://alebusph.centralcms.cloud/galeria/files/fatipebepakuxosofimikaz.pdf In PDF document text
    • http://chanhungcorp.com/images/uploads/files/taxexaf.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613363be7b383---83531946269.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/sirot.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/vifupujakajufuwipopuru.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/pudofebenul.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/8167981574.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450e289c3c8---88178856782.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fanuzuxurataroje.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76482859214.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/ruxitigit.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/76084184769.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/zodologunasujo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/53102969152.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/kavalufizopufivunaxari.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/nikuvuwadikigikudumuzot.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/safexejilagaxuzixifelovo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/40999320334.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/70290128369.pdfIn PDF document text
    • https://satesayap.com/contents/files/98117785484.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630803847.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zemaxilifamex.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/pomamidari.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3ae121323912b3e96e720cc4886ea3d3/lobupixajapibupokarewev.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=css+the+missing+manual+4th+edition+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/69705657730.pdfIn PDF document text
    • 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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 11052 bytes
SHA-256: b3b36747b7e430b1529b532790191c4c1bf51da4aff46c5026d43a5633ea48e4

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