Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9a2ac971912c40…

MALICIOUS

PDF

112.5 KB Created: 2021-09-21 22:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 154bb5f7f6b10984048e40bd49cff968 SHA-1: 3b8581cfd8ce37efc16d10e4f69c990de477dc8c SHA-256: dc9a2ac971912c40990732aa84714442763fc3a829c6dd763c62b28c8a2c94b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 https://garglob.ru/uplcv?utm_term=usa+has+which+type+of+government PDF link annotation
    • http://cabinet-blin.fr/ressource/site-image/files/lugogiwevorubasivup.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/96708527131.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84be47a66---59251789704.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136398153bc9---73669170886.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a20a43d73---borijidunosaxipagadonip.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/kokakabeduwejorap.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/raxafamuvedosibodax.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/60162153400.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/nivoxotatoraluxedi.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/xefitasup.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/fowosusomipu.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_233029.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365a0c54ce2---piwobenapanerovikimupa.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jonodelademabagilavefetip.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/13512254147.pdfIn PDF document text
    • https://hgb.se/filer/file/juramebelaxiduvivefozikoz.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/gonus.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/fijevuv.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/bejarejeb.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/14893524937.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/xiwitizotuxebo.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/tawusipagugogasexodeb.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d1dcafb---59802310162.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489368044ba---mamafilurajigebob.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2773eed7ae2ffc5bc1207b975be0507/43955933113.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/1419902717.pdfIn PDF document text
    • 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_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 11156 bytes
SHA-256: 7598a59cb19af511c6309d83b222252c91ef507d5df5b7c863d89fe54160272f
font_01_sfnt_off00016b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B00 18784 bytes
SHA-256: 45cd19b0a80928cb757462cd10b0322c1e090f82a1995d684541227b4ae0a92d
font_02_sfnt_off00019be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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