Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5d6ff60051fa5b…

MALICIOUS

PDF

67.0 KB Created: 2021-05-10 06:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d91fe8397be86d5013b0ae98f8e617c2 SHA-1: 967f8b6f01167928137f578bea25f8497017607e SHA-256: ef5d6ff60051fa5b189ebde0ce1e7b88216591531acdea1f7dee087fb9ce57b7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, indicates a lure related to 'Socrates and plato pdf', likely to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8307

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=socrates+and+plato+pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751483bdf8---verisifolovafemujubevij.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vi7k2lgvna7edsonasj5hu366v/funinaviragosekadaj.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/559bec2a191d5be05772a633c0a93b70/damefizomibejulaxujetaze.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d047076e41---vesefuxavesijudod.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160750da30e4ef---97728176275.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774075df73e---pasesaxopowol.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5b497653---74702057857.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/8b1512dff96a715b07e9ea0d22709de4/26210530723.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/723b6ae9f509caa4865cf9fd6898885f/laduwa.pdf
    • https://eobliecky.sk/userfiles/file/sekevomatikux.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817300cd3b0---48006775162.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/99382094094.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cece020d10d274a566f5fd358036fce8/wafebukejeganome.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948d502184---ruwivelukugitagasavadim.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d26e2ae3b---80745965011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c9.bin
4c3242074fca7ebe85c2e8f420c385c8bdc46ada9734e5192ee33d3f23c9df3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 5252 bytes

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