Malicious PDF — malware analysis report

Static analysis result for SHA-256 469fbb33adeda447…

MALICIOUS

PDF

89.0 KB Created: 2021-07-27 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f8b7d57b0a827adf74a4b47ba913895 SHA-1: f7e52f56f064a3c09c6e7abc9eef952d38b591e0 SHA-256: 469fbb33adeda4473ce773ba6f50d47c7cc22935765a3bb5993b5e3ef56dd305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ff1d5aecc4f65bc226532d139ecbba2c/natebupaz.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712a797287f---nekedatazukiwinavuvawujo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b6edcc2df6e---23223195719.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d137f5b0af6ab5495edd1984aa313eda/91896016317.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kpmmd9a03nc9gtesl8au7du9bf/40978311201.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16207370664013.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/gugali.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/c2447e5f721f4051c3ec7b49fa1b8584/xidisebuxulixoworafaparot.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5e8aca4a1770fafbc91c37c43ce035a8/3677836237.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab921c06a71---74124129940.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1fc46c10e2263858d8acc1b0eb60ef15/vevega.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fe7ed1358---vominuxepujoxiru.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/dogiwawenemekabapaweje.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jcis241mv8kouj27e7ut39pevm/57610010579.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/munuwanemipe.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/gilobitamivukulesix.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/0db27b7806d893dbabea3f208178384d/57093334234.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/13754209818.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/webufiko.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3e4375a2---derenufawidapokimat.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/24541314979.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sukapovikuxeme.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e42f917bce16990d6b8868f00939707b/32949498637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chemthink+covalent+bonding+answer+key+quizletPDF 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 17572 bytes
SHA-256: 67d656962b44eb2e79a8af721346555b79f78faf02bd28a5c71dd9ca1fc7c1ee
font_01_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 11652 bytes
SHA-256: 18b9a86b182eb77ce6fcd00c8daf9c6fc504f6db46fcacd22482bc607fb67ea3
font_02_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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