Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afd3582d4370750…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 09:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b752d5114b74c7c1c5812dbf0c140373 SHA-1: af2f90bae849bbe432d285417d140ff232244a97 SHA-256: 6afd3582d4370750ecb8272f446c50b09985dd6eb0c6d0bf854810e6c820ff8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb3f19c28---37182615994.pdf In PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/gekexogixiganejeguworifox.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d538muvv5lu80769keiuvprob2/xoragafuvumaxeliparo.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/dokemezupitoputeduwal.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082db941de61---zinagolaxesubidajifefupum.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/91843745678.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/4746990710.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/kasemizawawajit.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/66509825318.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/kedaxuzipiruwevesu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784111f24d4---mabuf.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/9716240218.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/jolegilaworubas.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e9f9bded---wivorajusi.pdfIn PDF document text
    • https://gameclub.by/uploads/files/23093222994.pdfIn PDF document text
    • https://khanikango.in/file/79692736270.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad705356103---zerudufelesarililopaxezub.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/72878467146.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/vekomudojekon.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/74828974740.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/19098954821.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3c95131f46dddb346a15a1ad0f40fc41/dazoxajibanupegeko.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kopamizuvawusavizaz.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/51682317690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wind+energy+project+pdfPDF 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_off0000bde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE2 10656 bytes
SHA-256: 8c9b4afb6c784341364c6d88b91a5dbb991ec47226587fa1a1e0c6f05011c709
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 15972 bytes
SHA-256: 3b322045b580b6031dadc770d2674838e479a113f61ae338f7301bb40cf0a712
font_02_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1