Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5e1b5efef495b6…

MALICIOUS

PDF

157.1 KB Created: 2021-07-27 20:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11bcad64d80e89e55a147bfa9e8d96b9 SHA-1: 4f8d71535f62439f72d379d76a46c2d4a3427d71 SHA-256: 8b5e1b5efef495b654562acc375ac2f87ce75615d2ea435a3e91196a73685f5c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a tactic of leveraging compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/30cc4fef9dd25f72348b2a7e863bf403/tapadej.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81e92ef7863f311e3c20117ebf45a345/186597689.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81016538319.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/56580545799.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/kuvinudugibepom.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/16317380795.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fba25965---61952699047.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/ledolejazefik.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/80960497239.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/sarajup.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a3opnjuptudkfsvk900sopteti/15183334019.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699cdf69---24458701024.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/42b2qs5trjb4llrbtbomg2ggbh/fijisuz.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0b6f5c0d65e05847e31b22b6d293022/migugitufafadifokoj.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/beb8585e542cdd0f3f209ceb8bb7e1a4/vibanazavitudadi.pdfIn PDF document text
    • http://ty-int.com/files/files/fasigepetokelaker.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a099c6956e5---510758267.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/61531528334.pdfIn PDF document text
    • https://inncredel.com/uploads/levulenowube.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/18456f14953adea73b36d87553034799/91189561703.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f913c34b---buruvotiwejigizariru.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/af206c7a497a8af42fcd42a7c130bed3/59099298365.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/64890786697.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/913b7655c26792904076130b2d9b42ee/zuwevufolutowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=living+in+balance+facilitator+guide+pdfPDF 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_off000208ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000220e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220E5 10888 bytes
SHA-256: 0d53568f9347fbc63d3f5fc1364a8584f8161b02c181c4155e57e2443f024035
font_02_sfnt_off000239cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239CF 16948 bytes
SHA-256: bb581090a2cad5fd4e92892530d6ce551a011aabca24b2b0517e50a2b3f959f6