Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d788f6b0e0a72…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 15:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72ce78b49b769dd261c9893f5dca5fa5 SHA-1: 3465dead841517e1759bf7e12dc795737e00b9f4 SHA-256: c70d788f6b0e0a7272a0e7a9e2b8106149743395376d5876979f384b0f29232c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and a link farm pointing to various websites, some of which appear to be compromised. The presence of a 'Password-protected archive handoff' heuristic suggests the document's intent is to trick the user into downloading an encrypted file, likely to bypass security scanning. The ML classifier strongly indicates maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=apk+online+decompiler PDF link annotation
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/24596651310.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/25403944077.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/90804129671.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/55307846001.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/36691504057.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/xumelakifepejiloludal.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143e0a31255f---92083366817.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/37884285713.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/68927359221.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3026fe92c9acea554d7964d1863dba53/xazotofogiwoza.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/balejadafolarujuzapiguj.pdfIn PDF document text
    • http://szm.hu/userfiles/file/luwafulukinumajegi.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/pabefokagetibirizijus.pdfIn PDF document text
    • https://subded.org/userfiles/file/71243850549.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fa7583b1---zuzirafebi.pdfIn PDF document text
    • http://precisao.org/files/files/59155703689.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/89611330379.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/48981972263.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/246eaf19ee31b93253d63f54f89f7696/dotizebopikisanodisi.pdfIn PDF document text
    • https://semut73.com/contents/files/sobov.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/47158901012.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911050733.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/66811703189.pdfIn PDF document text
    • https://andana.us/files/files/91910768755.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/2584335468.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sipegisepuk.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_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 17592 bytes
SHA-256: b4b5981e5cc0daca57ff9dc2b1a26fb7972c2702f56b0f1267f18c402f58f2a8
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 10320 bytes
SHA-256: 92c92aba406ae12b56eb283ea7f1f39f33ce575abbe01ce93510e7b2ef5e2a9a

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