Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4ec54593e518a8…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 21:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fddd7b118d99afcd862c518d6aad16d SHA-1: c7a9c34e5e600b70b31c68d92274f19fb7887cfe SHA-256: 2b4ec54593e518a8af4b3077101e968be3a641af0a362aa95450f770ea92db9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3247ai982mevba219pf0a5iq7s/71637714190.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4e126b70---muvuropewugugewotaniro.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf84e5325b---somebafusiwarugojowip.pdf
    • https://istocdukkan.com/userfiles/files/17172581718.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/599faff75182e3148bd52ff11a760d4f/68576909561.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc49eb94d---96691741752.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/173e0d5f727c30afbc047a52ce367dd5/laralefugiforapewufer.pdf
    • http://nesthomes.in/userfiles/file/75177510745.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7245eb3a1cd050028527b03b698a1f15/zanaxalizawaxepovirotan.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bd202f4f15b47783237b4b0e5dc6ac3f/37572481910.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/14f5a62e0f38e4bd599321a2eaa20ba9/lutogegitavixafowekuxolu.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f1c829dd---94666366196.pdf
    • http://asianmosaicnyc.com/userfiles/file/4991653779.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6db4cf45cec5a0d60382c907ca1d5be/vugixivekajefipilazonize.pdf
    • http://poltinka.ru/userfiles/file/duronimexisasunanuliluso.pdf
    • http://assushop.com/userfiles/assushop.com/file/luvemizoxepumaxetona.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090ac7ca3774---kixilosuz.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079eba0b00e0---zelabeke.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3323c69---82638304149.pdf
    • http://plncse.hu/php_data/file/51195085760.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53a166db98---98683454472.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=theory+of+product+pricing+in+microeconomics
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
font_01_sfnt_off000110b4.bin
b6f3b2284172e14b5bcd9a2026310dc609b17da0a8403ae4fb6018e61ce242cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 16908 bytes
font_02_sfnt_off00013cc4.bin
29dce2af73a744a51804d30c6fc0b7abf2db4ea8b0d1d74f6136ce91494cc948
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 11036 bytes