Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f900c3235e2534…

MALICIOUS

PDF

94.3 KB Created: 2021-07-31 03:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c98ef010d84c80e8cf14abcab0a9d593 SHA-1: c16658b362b6cb525530e83bbf157cbbd68cc7e2 SHA-256: 62f900c3235e2534304a33453d158d31fbdbb1360201eedd788f2f112a33bdab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=g%C3%A9n%C3%A9ralit%C3%A9s+sur+les+fonctions+num%C3%A9riques+exercices+corrig%C3%A9s+pdf+1+bac PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec06342a5a---fomalupamuxaz.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/rezekapiwozasu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///86577995042.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0695df066d---sagubapupizakewijamin.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93967128000.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/16200083846102e93493d38.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b3839a689---56884857564.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/82898972910.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/kawireguz.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071679f84418---94550812377.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3lqhil7ivn9pd53ukf95hes3sf/80182697888.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/35179660974.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0abbebe53a4875e1e4186392a6cc2690/36148066580.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/94519047764.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/92911749765.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084adeb76a19---bovovefo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035d9d680de---vurivomesomexokeleze.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085f56def6ac---51519840077.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/52316287192.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tapokuwuligajipep.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 16100 bytes
SHA-256: 6b54a3f50d1a413a5c8c0ed289a9c866e37e8bd73df0b162fe7132700ce54c18
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 19920 bytes
SHA-256: 8424b9153483ffd95437a86db00f6f0b53b4e8188c8a069a4b2282c9d2f1e1c5
font_02_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD7 11696 bytes
SHA-256: e43450ba702ca9ee542e6036600b3a6fc5e62880fe5155f32dd87cf10ac4bf9b

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