Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8c1adf1143163b…

MALICIOUS

PDF

90.3 KB Created: 2021-08-17 12:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994265b8ffb6ef46f40375182d6dd862 SHA-1: 181e022ce94e86b016f7b980d21e75cbecae0ae4 SHA-256: 8b8c1adf1143163baf885c1bdd53031269cf0821c163585a204eeed6be3c7bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of these links and the overall detection profile indicate a likely spearphishing attachment used to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=burrhus+frederic+skinner+libros+pdf PDF link annotation
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7ce55c2ccb391e5ff5b809c5d2950fa/3414923950.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/56604540028.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/66413677403.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cbf154755cc5091a730b9d91dda8e5b4/besulaputadetub.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/31797503126.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607196329c55a---65040369357.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/45645251269.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/05jlq44peu8cvtc4rpboflbut3/fejaxe.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/25939058396.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/mibiwetexumep.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c2stlgqb4379h0g1iqrekf8l25/97005128139.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161115fe1d1962---wuronefipelal.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1864231c12---vovukokibikobadusawidewor.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ek8ph17o58cgch6qmfnqdql1h5/wutikuzazolemag.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/35687928562.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc73944b0---potumofesoweja.pdfIn PDF document text
    • http://lactopad.com/uploads/files/52343768102.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/19424222352.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/39531269885.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/21168498165.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/zagil.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/def303ab6874a2749616b8107d34938a/vodinipiratebubukak.pdfIn PDF document text
    • 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_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 18052 bytes
SHA-256: ea867fc960ca749b5ed95aa5eb68ea823665ed3871a1252f262ca37ebc8e82e1
font_02_sfnt_off000140cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CC 10844 bytes
SHA-256: f950d63ac5b26a8d5d5d72412da8c3b97354ea9c12ff6fa4186ea51ede8510b2

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