Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee4806c3bcd3210…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 03:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20a1d042a74f0f469560e8f9e879473c SHA-1: ea99f3e924b61cbae223bb2b1d02c3ce95cb0196 SHA-256: 7ee4806c3bcd3210ba455688ef3720fab2a89583c117ab5e1987b2a5aacbe147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=political+theory+notes+pdf+du PDF link annotation
    • https://rugsinc.in/UserFiles/files/78194640863.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/85535180163.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608097a60bf29---vovamu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/66b7b73f296a3669c97233d16a3f02bf/fitadiwijulugarusowidu.pdfIn PDF document text
    • http://voijin.com/userfiles/files/bulanarirozujevadobegovo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c43f881a6f2089055a810f5f47cde195/nasumubared.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/ludisoxologadofelibo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/10kns77oi850327topfe9mhmtj/kopevovagejisizarega.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/fitidil.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088515e79bb6---loret.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcb557f0967c15d4227b375c2a20a599/mefiwigegukakelibaribize.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e1096b85---gokadusosupuvobajet.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/sagoxu.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/belodaweg.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wobuwujobijiba.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b50d8abbe---3081734080.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdfIn PDF document text
    • http://napiarsaigh.com/images/nokilutu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087078e74236---jofuf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/go4ljsp72vhgl7fo0rr0gi8aro/mesajogeditu.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wuzatugesevefamefizon.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcbb98238---mapuxalisosaregumi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3aa47d069697184e67620f82ef5e6063/kusokanixafozawovuviwa.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/povomib.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088914f93531---darowomixebudemurusoso.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4fd721a6f6dcba5d53d55b0571c63103/pewufamopip.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 19376 bytes
SHA-256: dcca73c09117b4a515a5eab0e736c84fb911391a7b37524d2d6db35e3b017c2b
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 10932 bytes
SHA-256: 3c7c12f708f81c8cf566c41db5f9c75f4278cabacb8ab2d52697aebdbd23c198

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