Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ef69ef1d56eb76…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 09:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e371039e770e85c921c398d7b51be1f4 SHA-1: 68bf0d465223a7fce8b35fa887fffa9eaa011fd3 SHA-256: b9ef69ef1d56eb76c00028933930229fe0e8ec75c0565995e95cd643e0a2bb47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=gastroesophageal+reflux+disease+treatment+pdf PDF link annotation
    • http://toyteepee.com/uploadfiles/file/210803011812901820tks2un.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/df4bc6e64c1541bccebe1cb1ef050622/59694769584.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/tuzatowo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b14d46a6d---27618186473.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/gonalowevaludolinoguroduw.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/84066443856.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a270d1f3eed---rinotetup.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe4707ebc---78917268038.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7eb3b0f---18184969548.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/8284523938.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/74595246192.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210621141417200.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zatudefebidugavunapenix.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fae8e4ed---20737698482.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/86846355532.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210621113842.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca2404681---85761147899.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/67008dcf1ebc2d3192c399780901d432/dipimokadelusu.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/polipegisibunufawivosepis.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5c2a71309b87e5f11b9aa0c4d31e3c33/bomik.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/24713316585.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/nonetagiradex.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/18040429288.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_off0000b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 14408 bytes
SHA-256: fd988cd9df8b08b0680fbfda3e50f5550ed39ac5b3d0803f692c838c5fe57690
font_01_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 11188 bytes
SHA-256: 179d3781ddf28003ea97d0ca4eb478c78fdd56b2b5a67c005bf5ce2c79ccfcdb
font_02_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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