Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a53bf4628c9cc81…

MALICIOUS

PDF

65.1 KB Created: 2021-07-03 10:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07b9616f17506a542a13430b5c9ac4bd SHA-1: 04c1f54ec6d677c7339107a5c1cc09e0cb07ff8e SHA-256: 0a53bf4628c9cc810048493bf6b41629cd755ba6baa7faa5f0781f0e4f151c30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable domains, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7786

Heuristics 5

  • 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
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b70b7a374bbf3884919a4f5acb9aa620/tefufegodiwafovowosuwi.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd628102f---fizizo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/butedefovinifusufet.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d25b0a98---metokix.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/80679441019.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bca6f728fe0bcebbcb1deca5a960260f/tupujiximererisixixi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tepal.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/55929808543.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/77691110968.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12c7509c2---31375368038.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfa6c7304e3f165a38a666e63d541e9e/31025124132.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/8005925432.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/5378326430.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/wowizigeziwigirun.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ci58v2c3q3i7qonmegtfinjef4/62687735053.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/97281169146.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b039ba55f0---ligad.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xuwuzumalodadozuti.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/36134744852.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hmg1gbklu25fp7mjtrripjic0v/fatopajava.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15bc77dbc---15154107682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=draw+the+human+heart+and+label+the+partsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10772 bytes
SHA-256: 8e1959230c3f251ce6a0b1f9fa2cd6e83215d47239cf1a6e1dd05788184194b7

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