Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d22bf52bf6db19f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 04:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7201b4d69db8787e71eceba4997c24a0 SHA-1: 4fe47dc18dd6f110cfda47f408802d2919e4666a SHA-256: 2d22bf52bf6db19fd5e0d60930618c159aa7c797879bb35b7d55ef076b2bb3e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/foluge.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e4f1e0cc---votawevufuwirizon.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/40215424315.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/90506911292.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/68871109076.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/winogiwuz.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/mulujubu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1405b2e8e178c2666f3e037126ae20fa/65533373261.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/giwixizokelumuperajun.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/vuduji.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f1b741a839a8760764d996e6de63cefb/batexesedafetop.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/nexanowivovibimilem.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/49499962530.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/gobuwugamunoxazifev.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3872db90e3---38305491666.pdfIn PDF document text
    • http://bienbao.org/uploads/files/siditurako.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a9487d529ca---5274951741.pdfIn PDF document text
    • http://gibisch.biz/files/files/46473669129.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zimunuzimofi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/44358926032.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/6632879650.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/61834696737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=frigidaire+70+pint+dehumidifier+fad704dwd+manualPDF 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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 11068 bytes
SHA-256: 537dfac7a02faa2977746e4c80da8968f4b9d3335c204d7a7093390f4d9ae98f
font_01_sfnt_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 17836 bytes
SHA-256: 56827802b04e1e17e969ef13d7ce25fc908d1a79b804c212937e6de0812d03e5

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