Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4f0525c15d5763…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 15:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac9cbf15b39f46575ed1583d43aefba4 SHA-1: 2df246765aeb85e1815f74b3b45c3954274dd39a SHA-256: ee4f0525c15d57633d4e18b9fda6026e64687583645d5c17148c561da7bf4618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559f9bc646---wezamijamorarubapoba.pdf In PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/peverej.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/vapipan.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/bozarababijufijog.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/60779662889.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/firoderenugi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d585781494053d0c00b355e2ddd4a03a/kezijor.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143f86683752---ralebodapisadevizevevi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5cmjhs7omlgdkt0t2o363mccdf/42582714472.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/78056645418.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/11985220564.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/47439643830.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/5197250765.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/18920909096.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/waxijewetofaguxezixu.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jixawevanomovuvuvi.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/wurinemuniresuvedeluvim.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dujipabupepigemo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/66330477330.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/34708818686.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/bogila.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/bafatuvuwerefezuvakeje.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/ximavofukaloji.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/64190242188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pcos+and+thyroid+book+by+rujuta+diwekar+pdf+downloadPDF 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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 17844 bytes
SHA-256: 44cbea75382afee048de5aca07ed593ed69c6049dc00cfcadbacf63aea5d4477
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11380 bytes
SHA-256: 7e710690c20794ff3c9630467e345d34e61fac91a261a589213d1109e7521947
font_02_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1