Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d0e8701312893…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 13:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 610dd86f85e6498cfa615b68ee48728f SHA-1: f26cb7d1919018cc1e3a0e8143476db452a43188 SHA-256: 7c5d0e87013128939c5c94f23d278d14048ffc5ce9f7c72f88ec1b9c47934d9e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs, which are part of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=how+to+answer+a+video+call+on+android PDF link annotation
    • http://thienlongadv.com/upload/files/45029639918.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/24165839493.pdfIn PDF document text
    • https://ms01bet.net/contents/files/jopefawabopuli.pdfIn PDF document text
    • https://yifff.se/userfiles/file/butujopujebikinepexolomo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5dc5b216e20d8e6a37249cc1fad66d1a/vugagif.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/wuzudirazedabixaxik.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/90614696608.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/runonilejoradixota.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/71876269687.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaad75f41b---91019061685.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7dcfe64a5c3d5a7f06f713d132b2b456/dewegilekimigopazexekevu.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/pagagilawapezezopibujoji.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419642368c3---tixobepem.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7e07e53a---77654955454.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vafanaruvijaguluvi.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/41147602426.pdfIn PDF document text
    • https://oferta.lt/i/File/bumekezozamesam.pdfIn PDF document text
    • https://aneri12.eu/res/file/82843900329.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f005217c4---menevepalonidedewik.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/pekogumubobus.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/59333819313.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/mazevopevi.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/91282852633.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/16124178680.pdfIn PDF document text
    • http://com123.vn/uploads/file/93390990046.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/nofodorebowetezewaluti.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_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 16468 bytes
SHA-256: f5c5770dad5d7dc49db2dc2c7f0f46166b81c834037fe88c801667ba31bf97f4
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10508 bytes
SHA-256: 07941013f63b37f1fff7ea90885e08d8e5bc6d3139cc4613807f0418868dd305
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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