Malicious PDF — malware analysis report

Static analysis result for SHA-256 634318897d8b9568…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 18:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81396f6a557c9328dd7196db6b9a1bef SHA-1: 92c2dc377d5f81a67c80b13c10604f50b9ecb0d4 SHA-256: 634318897d8b956869a0494b86d1922f22a96c76360a21b2bccd40470c6aecd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://ohdiabo.net/images/ckeditor/files/21599240298.pdf In PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/nqkpqqi5egamjj3q50ligvm0h6/tuvewezamawoxup.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wurosuluza.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c83e3150---79058660964.pdfIn PDF document text
    • http://hanleyresources.com/images/tilizavekimo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e98565db4---ketutibomerodawu.pdfIn PDF document text
    • https://unosms.us/userfiles/file/jelop.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/74293959275.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0f369284---mopazelunagevulor.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/95518918655.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7f1dc36f---zepexux.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/wafunopasebanonimowavanaz.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/76154250621.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/96551850306.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/kosexuf.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bfb997704---kasolafopanedalanenuvagam.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/89936900803.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/43841639427.pdfIn PDF document text
    • https://digireg.se/upload/rafaxepimepibuduvisumukor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dc83655c---37764720472.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/jaebafev829u0as8gerelv4hc7/84510619910.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3dbd2c5a---saxowonuxaxale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mietvertrag+pdf+zum+ausf%C3%BCllen+kostenlosPDF 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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 11344 bytes
SHA-256: 506d2706e840e10e8aa5bf67433a7c49c453e097a3bfccd87de49d74d5fdfd8d
font_02_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 20664 bytes
SHA-256: 5fb4f2460862a00c95bbe77ab5c3b2dcc275c1c9d7b7923ff3192733b61e5b4d

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