Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be0964499690451…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97651cd235b0449f96eba33ea0b1c77a SHA-1: d966b415aa5229c58d38a1f6b51d27224f19ac4a SHA-256: 6be09644996904516ca5ed2809f270a548585c0f41851c904edfa7a8169ecabc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=putty+wash+impression+technique+pdf', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=putty+wash+impression+technique+pdf PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e5b1887ca---35814153272.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/sadadudutejepaniva.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hsrrkedcctopreto3mr0e01b52/98049631844.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161195470886a6---kajobagibatidema.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/05623fb20a347a68aa43006db5c1913d/52959210235.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613180356c6ff---gegalu.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/tudovimikililazive.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa469cc9120---nowalodagopurotijusadisu.pdfIn PDF document text
    • https://andana.us/files/files/44022557581.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/4f84cbf541d1a21bdf88cef2710d9390/rulebodenumuvefivirop.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/monovixedawen.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318ed0d7181---ranodepoxarobuzife.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b918aaeb---54132047219.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78d9be610---pozonudasobum.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/jejixudoguwopesizo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce8954c3---6281696666.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/bopadoparik.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a33eee7a86ed05e8d211278ad6064189/bidobiker.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/modovusadofabekuwirol.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/xokadavodimanuxevojimem.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/dulopepenomo.pdfIn PDF document text
    • http://carszana.com/image/upload/File/84164841537.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 17872 bytes
SHA-256: 77e00af18ff897af7f67b63a96f39f87961b52789f6d94b9a7800bf6c25aadb5
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 11284 bytes
SHA-256: 3ccf2c02cefad8423df964e6fff648fe41710f44507fb12a12aa24d6ff91e670

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