Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa2d5030df473b…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 09:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc86119791c83a79c93986dd4d22da14 SHA-1: 365a8b5c281f419fe5d48660e990f64a31f1387d SHA-256: 20aa2d5030df473bf9c45412c5afad84e647b841161bb3b07e262aafc88258b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://memoservicesrl.it/file/7977277235.pdf In PDF document text
    • https://5a.ro/ckfinder/userfiles/files/vuxologun.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/426c5958bcd0787f1f7852301047e88d/84206744404.pdfIn PDF document text
    • http://dentistturkey.com/image/files/wezidapipaxe.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/zebozoxe.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/39669202162.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wukexokefinakat.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/59176551122.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607a076ce932b---jafumajimobivozagefe.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/cef4de076be4c50923eba59f1a7a5156/55719843223.pdfIn PDF document text
    • http://saydersan.com/firma/files/zopimazurawuf.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/47649084458.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95bd466f61eea9dff9d9192959e0914a/wegeviwuw.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/tutewugejenisewonadofeju.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210615210813.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f340a30f---nubuzu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/30963376414.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210619185641.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d02a1c3e2---52954726228.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/ribira.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8fe8aec826040dfe08e6f2c65063268d/zotifuzised.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/ribudepugo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b098e85747f---naliwojebofuwazudagexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kpss+mat+soru+%C3%A7%C3%B6z%C3%BCm%C3%BCPDF 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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 19792 bytes
SHA-256: c7276870f2bfe7ceef39a40e7b508809a2762206504b83dc89686ad7582e4f94
font_01_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 10792 bytes
SHA-256: c7d6b14ee7fa09fa13eb1d2ea74b3db07c28e4a39d439f9c09904fba47188cbe