Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6f3930559dbd68…

MALICIOUS

PDF

68.1 KB Created: 2021-09-19 22:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff82713765b04a890aa1e252c3ce48bc SHA-1: 6cc40ae17247c3e79796cc848b959fe17c1d9171 SHA-256: 7a6f3930559dbd68b59ed8736f3602fbe7acdcf2b11075492871ce4428ff45cf
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure, with minimal text and a single image, strongly indicates it's designed as a visual lure to entice clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dumitoxuwak.pdf In PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/68760177786.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/27048594971.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6977d1d5---26643687758.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/zojitaxowagizalekefilozig.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/62558834932.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/20368469262.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/95841027776.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ecca25a9e---dezasegageguwibo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/710fd08ac91e9a03fd9f667a833a4d45/55089792166.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210918045023_2036680528.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a2644d18d0156c2baaa6d2ec234f09cc/42497164154.pdfIn PDF document text
    • https://makenie.com/upload/files/28116104190.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/pozukubaganetisivekatonid.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/62408184199.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zizewib.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/fopazanizurulinoturif.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/potigekebedurigapopig.pdfIn PDF document text
    • http://labotinnghia.com/img/files/727004104.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/33728079716.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/duwipodukofizov.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/59720002066.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/72050553713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+install+android+os+on+samsung+galaxy+s4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 13772 bytes
SHA-256: 25e108b4675d106844bc74529054db342e0034932c51622cbf456e3b0a646604
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 10928 bytes
SHA-256: 1a503e167be8d3a1ff16a0fa87d87e9ff583ca961179be1ff1807d3439442336
font_02_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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