Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf56a6566f5f18cb…

MALICIOUS

PDF

82.7 KB Created: 2021-08-20 15:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a53f70a67ba54cffbf9b0133401b3d9a SHA-1: 93b295cc6e0193f3383af17105632cde48ec2715 SHA-256: cf56a6566f5f18cbe8d18580c7dbbe1dd17616e7d49f5a81d52e151f73af57c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mimpishio1.com/contents//files/bamufapojapowuxodasas.pdf In PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a678ac696e---88520563629.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/42266428120.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062021365069.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a83d343a19170b5c0e4fa3e1cf2af759/26575530054.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c8939a0e---73766199313.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/97871796392.pdfIn PDF document text
    • http://iphysiology.ru/upload/livaxajowawipukut.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/c10a7b61ee154022dc92a91e62cf8b81/suremelekupavewamiziliku.pdfIn PDF document text
    • https://petikdaun.com/contents//files/51152803648.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c3976a96---84770105877.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f7290daf0---33615132879.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/34b5acf37ba20c15349c8c41816ab635/sajuxotilovepozam.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3583fb11a254a44133a311315debb71f/vimiluninopeletuwajovipur.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/rajivuwizegetivedojesani.pdfIn PDF document text
    • http://ausafe.net/images/art/files/xitedekosufiwoxode.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/vunimerolakaturapuxak.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8cc9c72d35373e03802c089d6839e7b/15177908028.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nakonipobalonujuwela.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d63e67b4---29814883951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=jerarquia+de+operaciones+ejercicios+con+parentesisPDF link annotation
    • 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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 18012 bytes
SHA-256: 687fd354a57d7b5e46251f2b018e5c6b6bb44bfc8b2a08dd425045b4f87cc1b3
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 10828 bytes
SHA-256: 4a852a4fdcf943bc2a5664228bb1b0f168e7ac70f6fb27cf496cdab1ad63a531
font_02_sfnt_off000122be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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