Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d421beacf85614…

MALICIOUS

PDF

75.1 KB Created: 2021-05-10 08:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e3ca1a2effe4ba836079fd6c2c628c1 SHA-1: 8a9ce4bba7fd2fc6fedf7d0edb11492a36d73cc0 SHA-256: d9d421beacf8561495a3f485b119e8d7c00889e1bc5dd558c4d274078a7875f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oniceh.ru/uplcv?utm_term=direito+autoral+livro
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddc92beb3---28104958393.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lapatfsea7uu5s4mev13qiml9u/zofadajadatoxoso.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504082442833675.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875ef03fd87---musopovolaz.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6ikv8ub3vn858vnoth5la4rp73/rugagopisi.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826691e8745---60091840927.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ced3af32---kinapoxetonowem.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a166637136---7008592047.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e65d6508f---toganopaz.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8a27ad33af57930aaa94cb527a1c453c/vinenekabobeso.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d9af79e2632e45cebdf7fbda96ecf614/24515971430.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9e69e3acc842d8d6abf12f3676cd8d59/25464777655.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eba43bc72---44341150339.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160753917115d8---74056880731.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f20c8f167a0243b6dfee6f326964d6e/46924268496.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e824.bin
4f47528afd13ca8af3df9789940974733e8bea626b1e6a5464a6f35f7ec3b5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 4560 bytes
font_01_sfnt_off0000f7be.bin
e9adc22cfd193960f566a4fb8b9ea069542581be34c47d9c3045362f81fa39a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 12500 bytes

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