Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c0fc9dd44df870…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 16:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66eb68d53af8befe94048742bc60ea5c SHA-1: 86693f717d7d48fdffb679a6284f235d5a3b9f72 SHA-256: 99c0fc9dd44df870c82eb9aaf9da47e43443248ae38fc0da361e57525b8da637
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user or download a secondary payload, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://posicert.com/upload_fck/file/2021-9-13/20210913125005504631.pdf In PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210926/file/16326176741768.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/gepegad.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614740bf56319---zorevefosajaloruxulef.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-11/20210911022437422520.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/vigetugag.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/43996428262.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/tijokaporolasi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1633053453.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/toxadoguginumek.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/47159423834.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/wevaxodurikilolakavago.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/patajod.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee26086225---77047625448.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/84908856898.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/jubesixodusidubijekev.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/33047541900.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/divaga.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/74901192246.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0uq1a87v78dos5io4b7bmnfvcj/mubebelun.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/28969106152.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wavaxilenexorotibufal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=naming+acids+answersPDF 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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 10512 bytes
SHA-256: 7aad0d1d8343599e8b77be054e87445712b6613dc2e7285ce814f4dbb170da93
font_01_sfnt_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16368 bytes
SHA-256: eb43dc163a1ddd270bb9709e82e5a3db4f7c8e0646688ae0d9cf0912de9bf0ea
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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