Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72042932b471999…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 09:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6cc8ca503cc7fde41678befaddaf5a2 SHA-1: 088bf8d61152351d35794511ecaa52e8de93f87b SHA-256: e72042932b4719993af7d72d6bd2faf3fe21fd728dc9fd41bd4061231b35af93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=video+call+and+watch+movie+app PDF link annotation
    • http://chizclean.ru/files/fck/file/89628775813.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/luwuvegeronipudebaja.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/81690398452.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/71a475490b061d4fbb8a5a34ac38c91c/potoxoru.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/11332694458.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/sikolunux.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/819301513a00d4658f5beae257764e05/tukabubokakonijinulisuv.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/928748a95f4a9961d4afe95797e79bd2/vogitofulegutowutivin.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/67594434644.pdfIn PDF document text
    • http://mcutech.net/files/77484068134.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146741a0b940---pawazof.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xurixumerek.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/kawozigis.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/gagemaduxafuwusejifimi.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/jimalanaru.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/34857197542.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/414197890.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7ea6c5f7---3767429823.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pezadudomom.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/e45kbijdg78tdmst425tnj54n6/bubotovokupux.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/talalipojagob.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/20839345815.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/lekiwumavoxuz.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/numosudugusajikuzolemi.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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 15372 bytes
SHA-256: aab8789b2697567bbe23a11cf376630d9906b2807323dcaf1f1d89ff8d98c189
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10632 bytes
SHA-256: 92d896a570675b26332173ee9f829bcce138812af57ff551309496971cfcd815
font_02_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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