Malicious PDF — malware analysis report

Static analysis result for SHA-256 45043c7b81dc59d9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 17:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02c07b4fe66997275ec8f86e200e11c6 SHA-1: a11965ea54be7d8816839afdf8e0e4cea6f418bd SHA-256: 45043c7b81dc59d920dbb5aed4b13947f64f2ee4d2de94ce14828909f2c237fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose beyond acting as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/muxakemes.pdf In PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/waburoxewonadozewan.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea3d5be1f2---baliv.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/gowegeno.pdfIn PDF document text
    • https://wrd13.com/force/file/9602213630.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5196d0b49---nufonigenekaj.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac10cc8a47---39383085313.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hv18hm3lirqklb3b9k62l44squ/maropewul.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e2082e70---69405117887.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/33673999203.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/21697675403.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10f7a13e0---genazabemafabasejosaraj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a4140b661c408fa5a9bf9f0bfc7afee8/48738763869.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/dezogizerofelukisag.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/h7ut20bm6p3rgrmqpcum4pb1a0/nozeteputozinosewilezosoj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/51174495076.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/filuvetokaguroluxusenifi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495e4869e5---8014551287.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a04ca18322bdcf45cb6920832d04dd5/81566406663.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zimuzonotevolenupasozob.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d801fcabe22cf88cbd4ac85debeb72c8/8552506624.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/42415693677.pdfIn PDF document text
    • http://irollee.com/userfiles/file/rezijogezeforekevasaz.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bed62bb314f7d70a5218cc23f5da29f9/sosowudogowuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=motorcycle+mp3+audio+alarm+system+manualPDF 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 11052 bytes
SHA-256: 037115890e6b1ab853b4be084eed78a151479f4d6416ba075f72e9188991bfd8
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 17724 bytes
SHA-256: b883eb6aba7dc7bca56f5d5844b68a57300c94b87ca6b5767418db4bfe468178
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1