Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f6d5a70b38ac7b…

MALICIOUS

PDF

69.8 KB Created: 2021-05-29 01:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d23c80b17c764ed8c33f9ed8bd9074 SHA-1: 0b7f9c1da330a84d32e2c16afbe58ba6f5d4a176 SHA-256: 47f6d5a70b38ac7b7340c8f61262791596d91c1b5a209ea78faebb3935d816d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also hosts a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious files or redirect users to phishing sites. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad143bed9e9---fixaloje.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609045c195ba3---niputijakazaloretinifoza.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7953e2788---dixabawogitawixeki.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3798c16fa---fikezozopibubisiba.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/14860588116.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4f53cfc80ff166a3c30703f94950b3aa/nudonerimimisozesere.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7f93b2dd3fe47771b2f20e86eda05301/27264428931.pdf
    • https://adepotcustom.com/UploadFiles/file/20210503005436184.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e3127416---43706866289.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/a3d200e4ec30b4c71f68d6668c84b076/kirabajamikelonidazan.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608383840bcec---mituxizusunug.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2aabb427---pibifawex.pdf
    • https://didacostruzioni.it/userfiles/file/98924037263.pdf
    • http://asupuro.com/user_data/image//file/11212365446.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tabomvv8cugauono1gdi6knav1/bubiponixaguxonofe.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea01f19ec4---sunewebexelevasafonuvumiv.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c5656e54635ccecdda9bd9d8cc691995/dizoson.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kaiser+release+of+information+form+southern+california
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17d.bin
e6ef7e794c372ffd53fcd8ab94a76684e881362192c93db65552476a5681f1aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 5092 bytes
font_01_sfnt_off0000e2a5.bin
5e819326e40146610b2cb6aba95a9b5892a40f9e6bb4a75b24c8b01cf74aba46
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 11320 bytes