Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b84a23494ea5b…

MALICIOUS

PDF

77.5 KB Created: 2021-07-28 03:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e28cd2e8dfacd36a842fe775c0a03eb SHA-1: 60bf48b5b1170dfb1559c6b1697d563558478272 SHA-256: 078b84a23494ea5bfb88c92e8abadd04accf474beadf38fc24c5113301c1e641
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8856

Heuristics 6

  • 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.
  • 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 https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608af077d834a---vodasiwofan.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c7425d306d32d9fcf1fbcb0107d96fed/wekusevepakulidubopi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/893035aa51fd3a1b2e0b8d6a2c9add89/wobuxewaxobudupolifuza.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/54269748500.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/89247438652.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/jiwoxirizibogoxixewagaxu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215252021217789.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604c0e69a6---53203387099.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/mejinapoxevojudepi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b28805a95984bafc0d009612906f5a5c/gubiporaxa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160909145a8b42---zamevamajisaken.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/moxugovebozononebuzaf.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16cb0d3f30---wiriluburegoka.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/najetedod.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/59193887387.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/wowurafoxuda.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/11843936758.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///mizovafe.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/81914153243.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/wesezixokivizegoku.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/70745810288.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84903664608.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38238882867.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607df48f5db5d---21588166280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+adjust+pressure+on+philips+respironics+system+onePDF 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_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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