Malicious PDF — malware analysis report

Static analysis result for SHA-256 406ade7c30b69b1b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 06:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 955049215a7e33ad63666d2f8752bb00 SHA-1: a3d4a26789241b90888b062f524493936fd0301a SHA-256: 406ade7c30b69b1baf24e42ea3b0dd9dcb1355d7086cdf55e0787d34be6cc44a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cx-gl.hu/images/files/36031473397.pdf In PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/17365981741.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vojes.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/67727735573.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/delosito.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2q4jtiokn8q8uvbe7i6ilo1cql/8921632013.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613597c889d6c---dovigixalowedelefezi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444731162aa---2986781665.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/numuvudefisenezafawepi.pdfIn PDF document text
    • https://norservis.cz/files/files/47164485016.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ccee4ae90.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tusatebikuzinifetesupope.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456cff79d3d---6069412208.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/13511713973.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/zetaguwolega.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/77881277622.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/46046525937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+hacks+among+us+iphonePDF 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_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 18020 bytes
SHA-256: a6edaca060a5b0a108597112862ded3986a51c0ace7a7467bf0afe7b7c5863c7
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10944 bytes
SHA-256: a48abf2e5b240a1f0d668417c6ebf1699a3a06bb8ef7909721a98b0590a1d89c