Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a619cbfe462964…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 14:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f189e4b1023d150554788f1f8e742680 SHA-1: b0c0dcd4685409ebe74a2704daaa730662a3f545 SHA-256: e8a619cbfe46296463ed5fce8fc921f2ef0f316c21be63b0c30f151a27789a26
164 Risk Score

Malware Insights

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

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 facilitates the redirection to these external sites, which are structured as a link farm to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://upakuika.com/img/file/6281393280.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d58e9668e5---77180430106.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/14943850407.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pejid.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vimadaxe.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/52751428129.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/11612374586.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/sr415ku2cspc5kcbglj8vao325/vinugidupuzavux.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/kinasisu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/velikenubilexevawekoko.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1356b38081d5ba889d832bfc20bb5390/famov.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/79137612712.pdfIn PDF document text
    • http://asustainable.com/global/file/60186450698.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/92007669872.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/68732227030.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/3987139983.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3d6066b2---7979672561.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/kobajosojemupo.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/sujaniviwuxavetupotimir.pdfIn PDF document text
    • http://kabinet.puzat.ru/marafon/uploads/files/44463302658.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/48752741864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+camera+qr+code+not+workingPDF 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_off0000ad4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4F 16996 bytes
SHA-256: 93043112aa7c16275ea0df981376c465a98777b5fdd8cf85d7cf816ef0f31ba7
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 10804 bytes
SHA-256: cb7b1c50e3b25f3b929b7beb71e5e731120249fd5d2b87ea78d2e79d83a68c45