Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81404e5a4f19a6d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 10:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8966f6dfafb31276ac97ed3cde9e279 SHA-1: 7e6ae40a6af0f62dc42d4ace825d4f66689e52b0 SHA-256: c81404e5a4f19a6d09415ac4ce4bc0599c89958556a3cdb7873f4a8b47d51ebb
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' lure further supports this, suggesting the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d9952954020a77218fecc417232fd821/fajididalokodurisusu.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a1226804d88---rokobipotatisap.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/3100038662.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/74276ed8aea02f7582b4a49cac620767/98280746735.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bdea27e215a1e6ce7ce82f607b85beb8/gijepunubidaponatutif.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/90846007176.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b098a044b187a53d83a87aaa031ec360/xabirukaxalozukasub.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lf9skf0473tisg1f957p23jdm2/97199235476.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hpphp7942m1umb78kqpbc3mo31/bimilizunerabijezilevoj.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/807bcec25bf84d07132b56477d78d366/ragakobapobowegesud.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/85405436288.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vawanisoposiwupujuxagide.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/36247719930.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094d63d2dde1---kinale.pdfIn PDF document text
    • https://campermagazine.tv/public/file/30722073227.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/r0mi54f30dnim29ogqcktom3c1/69670247977.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/3622098896.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db445ca3501---nojudij.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae625006421---rujasagozonibudatiwukexo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cef5be3cbf3---faxudavigitave.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lesiradekebegidafimuxovoz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qaocsr2nfqsabcauujupgelhcm/ripopuxalapiludawugab.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4s9k2s4rmrf575v5gd9d96m0s1/92178738738.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/95418257556.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/8eea6d92e7435adf91aa4aa2136a2f97/remagajufulesosufese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+download+and+upload+filesPDF 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_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16896 bytes
SHA-256: c2ae3f144ef801ae0e69a18aa580f9a435e08b7bbf184e4f7f6bef6ba0e08a7e
font_01_sfnt_off00012416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12416 10568 bytes
SHA-256: 4073070f12f93ab0b735e40d186535ab61580b953bd34bacf9b36dc0b0c1620c
font_02_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.