Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd2d9d26fe9c51c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 06:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af9247a02eb4c0d45e070ca60bfa1340 SHA-1: 32f1e1b398056258915562c798d53e3b4df37506 SHA-256: ecd2d9d26fe9c51cb72ab5456b0078b1af09da690a3ffc7668c7b17fbe7d8b88
172 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect the user to a phishing site. The presence of a 'download button' lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=redmi+note+9s+global+android+11 PDF link annotation
    • http://www.rify.us/cms-uploads/files/vetetivibogum.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/runuzuxuvezur.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/ribufajisadamom.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/94843487996.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/fovojalijivow.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc657ca56---13395163589.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/97439010200.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/pawixobigubibibazotutetuf.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///gilefanix.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/35141307239.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tomimixa.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/jezisepunima.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109171230042043.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c59c90070---91078874750.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/67724489947.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8cbohgcv6mmg6nbo3pkbr2o8m0/nitiwotufonakuve.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/75771029473.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/20300104231.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/pedosozarosizuwotokawulu.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/punubu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/67340836560.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/gulusosonilozarurofilasu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/vajidu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/26290772833.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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 10996 bytes
SHA-256: e28e67156a0a56895c80a3c6574b225f05a48bd64a1fee4024a440d6d6be10a3
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 18932 bytes
SHA-256: 2413e0e4954648150960498c20037b4a9f8006e91d0218b0f53a7c01379c6c8d

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