Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1a046e20f5e6f7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 23:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6e95bd79bfe8e40707fb88fa9acba9bc SHA-1: 506944ef6952ab98651a2d4182c6b8383917c0df SHA-256: 8c1a046e20f5e6f7224bed19217978281b50d905ded00b30efd120dd352bb01e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, some pointing to compromised websites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=aplicacion+para+extraer+archivos+zip+android PDF link annotation
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/17895046516.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/69750127735.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/luzugizes.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16131f231432f7---vukon.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/36086514393.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/vozanomokej.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/roruvewalirobapususe.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0c88e190---3255461405.pdfIn PDF document text
    • http://arsvet.ru/img/upload/bujezuvif.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/kimalat.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/pegikamum.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mogofos.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/59541879622.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/lemitebofe.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/guwokuxadavovusik.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161414324cf015---95086442723.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/letoxapuzi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109020400475920.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/111450337824.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/volowujezumagedurob.pdfIn PDF document text
    • http://mfahk.com/upload/files/beraluteponogawozakasi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/depabeko.pdfIn PDF document text
    • http://flomojapan.com/upload/files/25056795195.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/31156446424.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109012213442834.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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 19272 bytes
SHA-256: f008fa01941fabfd80f2157e0c8a8cbcb758e339acf7cf3f608c41a549d0d894
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10820 bytes
SHA-256: e7f224ce3a95420224a8ec421b29c7ee451e248c81157ccfd92bf17068269be2

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