Malicious PDF — malware analysis report

Static analysis result for SHA-256 0226fadc30a2fb8c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 17:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 452a20352722b572b2bbd43d6456bd17 SHA-1: 377afdf1767d6ae459bf727c1896c25a3d9033f2 SHA-256: 0226fadc30a2fb8ccce69da3a956204be771c22f79886f6b9747b70082c56f22
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rajakedua.com/contents/files/napole.pdf In PDF document text
    • http://maszyny.pl/userfiles/file/wofifozavexoged.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/tosud.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138422ca7075---rokevitofaxekatepulelura.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/59043779778.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/35841566659.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210917115133953.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613492c94e36b---96215678848.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/mefaku.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/brdceuulhnp96r5ocr9825b4mu/72580193132.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/sp3psf34jjjc8ss27gvogr7535/32202702767.pdfIn PDF document text
    • http://www.bash.cl/media/file/6599283708.pdfIn PDF document text
    • https://zhansq.cn/upload/file/tojatuduwepidurimexegari.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/86992633695.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910162511.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/63981976370.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/39940988090.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210902091009.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a017e8846a565e6d3f9d35fe107db9b3/8389705269.pdfIn PDF document text
    • http://telektrans.hu/editor_up/16898852635.pdfIn PDF document text
    • http://chayka-svg.ru/files/42033700819.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/28983602739.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/tewepikivinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+move+from+gallery+to+sd+cardPDF 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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 10880 bytes
SHA-256: b0f4065aed1cde007a2a97c1107f4afb93b391b44c250f3fb792ddc9c17d4ba6
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 17096 bytes
SHA-256: 3aba4c75cab0e193b8d7ed9b2e8e02171a3e7d3c58a6cb730e1fa23f48ad4229