Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d856e31c93944a9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 07:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8505ee21da8318e216e4a53d73115df SHA-1: 9546fa9d2a8dfdea2b1816f1bb278ad7993d4f94 SHA-256: 2d856e31c93944a9ebffeafc0ab94f74faad5f61034a08dc4b323bc0a843d61e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8f5e486b---573370635.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180b94afae---23259599073.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/46480806703.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/68072361788.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040ebaf448---xemonezufixokurimuzuwuwed.pdfIn PDF document text
    • http://taociren.com/upload/file/210907055044665751usg7vn0pypi5.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///riwatunow.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/liwexaxumo.pdfIn PDF document text
    • https://profm.hu/files/file/99126381971.pdfIn PDF document text
    • http://haai.org/upload/file/92665997226.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/22957507801.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/71580161315.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145929a52c45---garopimozitumamopofi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pivibazafaxo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/66295458351.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/59122582531.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/42810474940.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/totelebofejejotiwax.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nubewanupotasexatuze.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33415667902.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/34607329027.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/zujokotozefebi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dazevanasududigalotaba.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/21618491033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+java+edition+free+apk+1.17PDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 18632 bytes
SHA-256: c531ca6406f6492d5f1ebdb9bf84db32e8b39e32b0db3799005e1412229a8cde
font_01_sfnt_off0001185d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185D 10848 bytes
SHA-256: 01cfb0351f6e41a23c55f0da20a882e66cbbd3c09a7854f21f90af2a97ac3fdb

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