Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a41b5e686866710…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 10:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51b267949eccda509893da6d912442e6 SHA-1: 3d66414c90f745a7f11487cdbbc20e4d75d71d06 SHA-256: 9a41b5e686866710f2d880a871a42bb5afdb57c160656ccb9021094312ebbe1f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a likely phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cementfeet.com/userfiles/file/76057882261.pdf In PDF document text
    • http://giasuthienphuc.com/Images_upload/files/malakaxazolevif.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/melupuzuxu.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/dalolaboferejijiwajopek.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/68981812908.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d67ea6782e---xupufaguvegaditip.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/74453693179.pdfIn PDF document text
    • http://rld-carbon.ru/file/19659032797.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/23377200720.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/tatakawox.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/6108493866.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/kagigarajozusu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/77fdbc8139d06a9518531ac8159cb6e8/mopovofadofatamenim.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rorot.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/2983220817.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/limobasunig.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/4436090100.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/11893166640.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/lebemetoku.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392faf62cbe.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/gulone.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7fd31abb4---27404249452.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/fodusepimibofijokuzozokag.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/dororevodonobiwajifuno.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109101800467846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=yo+te+miro+pdfPDF 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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10164 bytes
SHA-256: c4ea4e4958e7538132ffada296a584be109b9abc899a5bba0f2324c73caf699f