Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1f12548779b465…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 5f7079b7e7bc008143296724f6dfcdbf SHA-1: 905268a4a17a6194e089f3307e442a9a822ef6b6 SHA-256: db1f12548779b465be445526c301673a317ecb261ccfc3378acff45c1a34b562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm likely intended to redirect users to phishing or malware distribution sites. The presence of these links suggests an attempt to trick users into visiting malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=visualizar+un+pdf+con+php PDF link annotation
    • https://247christianity.org/fckeditor/userfiles/file/609550696221622229510.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16272255972.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3998e38e1019114e23973102bb35fd1a/63468784638.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ee4edf711f9e59d73507de72f25cbdf1/duvuxivopixun.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba734635d---votesatitelezad.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/42739495487.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/17141426428.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/23617826596.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9e5520b0---44070295990.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/figuvenupujub.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/41707361591.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/lusejefezexomapajoxusidiw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b82027e---kojozisev.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/pejixolawiwexujazomapul.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ed3180e13---bakije.pdfIn PDF document text
    • https://fallsplat.se/file/tesotopefoxu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/xepebora.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/79559459108.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092265193156---vojejipirifimadul.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/44e4rvai8famrm0n7l1icin9g0/63155423302.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/musivobafatulobirovawi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/daa8f6571704a15696431d2e3f570d56/425406867.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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 19388 bytes
SHA-256: 420daebb82e4d9f2fb31983df12349f897fe2f37cb0c620d729d2231a922c2d8
font_01_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 10616 bytes
SHA-256: df5e068e47b4a30c44e3f3dcb8f2bca3abf4987df73b3be036ca2bb1213baa55
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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