Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f85eadc3ead5b7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 14:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0002544bcb8d98415e2be3846e497e8 SHA-1: c7d9460c59311f19b0dbfa8a7c976c4d2b932d03 SHA-256: 97f85eadc3ead5b727d61d49823e10fcf70735c8a2c4198671fed97abd59988d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection or further payload delivery. The numerous URLs suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://irlanc.ru/uplcv?utm_term=pokemon+diamond+and+pearl+apk+download PDF link annotation
    • http://pickup-ws.com/userfiles/files/20197437580.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/97574553553.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vobudodekatibole.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613587379f035.pdfIn PDF document text
    • http://tianfonmm.com/d/files/92284579386.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210927125042.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zunobowosafedokivola.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jetozibakamojeduwuwij.pdfIn PDF document text
    • http://wych123.com/upload/files/towevosiruxifexanuwun.pdfIn PDF document text
    • http://foodchemsino.com/d/files/1311440296.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/tetabekuvilubudegixojopo.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/wekigolitorawovekaki.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/sisolofuzotademe.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/50759797260.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523b37a40ba---41193056164.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/pukepegusagaruve.pdfIn PDF document text
    • https://produse-zilan.ro/files/fokiroxofupivofofirisu.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/vevosepikumibi.pdfIn PDF document text
    • http://charivne.info/images/file/zosotaf.pdfIn PDF document text
    • http://gibisch.org/files/files/xaruralini.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6596a69---divemebub.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2646c185---68536213431.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/84764487799.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nof3gfru6ssipmidodiimepv34/83094699426.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 10464 bytes
SHA-256: 4c831cbbf15ab9df7ad80cedbdd9416dcfd7e9c3d21723f4d330fefa661bca72
font_01_sfnt_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 15316 bytes
SHA-256: d7c0ad5250e39d041864c5f632cb4bff74a1b4c540a2ee59fbff9e6c9f38e57a
font_02_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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