Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf99e94b6cf6d4d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-21 16:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8a58c744a8516d96a5e24ddfb895801 SHA-1: c2edbfaae980bbb35c6aa2ad5fa6d4547a120fbe SHA-256: 2bf99e94b6cf6d4d25fd01518b346d26e20f449bb1c23fdce1bf216121353893
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of embedded JavaScript streams indicates potential for dynamic execution of malicious code, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coastalstudio.com/images/main/file/22857206094.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/40736561195.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc7766194---78176289953.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/60938641380.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9c340b4cb2961ff442bea69f94a062ef/nutavejav.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/xelijonagokofage.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/81442234789.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/51526150673.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210918_1CD4809BD6D71A4A.pdfIn PDF document text
    • http://guchen.ru/d/files/pidabosavulesepusize.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/wokozemurejisepeketarada.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908203506.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/30913164770.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/gexotunofasugilakige.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/97495139018.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/52382132024.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613162a96f3dd---jexirowalupaxezesomojelaj.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/69426583089.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/96426242367.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/siripubomela.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/logilak.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/bexubulolonobubidijox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=typany+keyboard+apk+downloadPDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10420 bytes
SHA-256: 2d9b4738ddd1576f8c50e53213a0c7eec187aa85ea3874fb9adda7fa596dd818
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 22148 bytes
SHA-256: 57f5d7a93fa790019baea762a34aa9ac1ea2b2385f3b7e48112bc593bbec4c55
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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