Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f251d2221c2254…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 18:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29816344b385dd4ad840561e3804e908 SHA-1: ccb1a4f67c1fad2b9dc472f2abd0e6fe600b936b SHA-256: 56f251d2221c2254ac75db1c8d3e442da7ce0c4467fc020e011de25e2b36d399
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and embedded URLs align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jooli.ru/ckfinder/userfiles/files/pigoguxamewotefigabafox.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae9768892---30100055402.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/30560581283.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gewiviwovor.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/444a78b1980f2493bf1281ecb7eb3d7b/97370327675.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/30223799037.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/3975052215.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136498030514---74901526504.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nufexopigar.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906034758181307.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210913010624961002fc2oibjjfvrm.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7fcd40a23d379c9220ca6c99a4bb70f1/93286748142.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/lovutanotivobokipog.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109120533425788.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/vokuvogipid.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/43841767357.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/lipifatofaxote.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/wixanux.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/10497604670.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/5878355142.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/50049463322.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/zokitugupuzanelo.pdfIn PDF document text
    • http://sireny.net/share/files/92516549537.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/lifevebowopefipot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=azw3+to+pdf+converter+free+downloadPDF 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_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 18180 bytes
SHA-256: 48a41b24ab750fd4b49f0ad919663eced9ee3be6c90d1d02275222ce21207c7b
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10720 bytes
SHA-256: 9491396a247b188c17fbdca967d5f8fc8ae12b707ae26aec1279862e034c0bb8
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1