Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7458fb5aa3c8154…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 00:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8dbd21708d0a4fc28db508ea2d8bfd86 SHA-1: a233ec5d9bc2f2c3fa316414f25ad80759056b32 SHA-256: b7458fb5aa3c8154f35d4d43b57c380cbdcbd96bc2f6ecc4082c5ffb2d715014
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to various external PDF files. Several heuristics indicate the PDF is designed to host numerous links, many on disposable or compromised domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of external links and the overall structure strongly suggest a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=clearance+hole+chart+metric+pdf PDF link annotation
    • http://nextgt.eu/uploads/file/kozezosaburabudu.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/36786681363.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c31419c415476d9ebd594c7acce2f35d/51071550247.pdfIn PDF document text
    • https://hirurgija.me//files/43060368674.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/nozanoxesizeb.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/5090802379.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/40180519620.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7d0d7c3aeeda63db2c4c7d23d4615219/16504218136.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/002200da5a16a60b2230262bacd17b1d/zezavaxudaxibiwowasur.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/10dhp5une6atsbcmp07040nlm3/goxapexomas.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/tivubekit.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/vemedu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210723_C2F079E629063620.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///19659761396.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770750866a---wajamenutivak.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fade724390e892e1c0f933e158c1098e/fitazipebiparukukojorere.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b821786b---85197994073.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8pb6q49h9of42ltu25vll85972/girozazavasuju.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/11592726196.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/voxirujixazaxe.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/madagabegik.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8fc91585c---23403445283.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/55548703057.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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 17700 bytes
SHA-256: f5ef4264e542dafdc1e412e6b337abcdd9928c804b3830af0c5840a434bb0d48
font_01_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 10748 bytes
SHA-256: b80329dc4e894a91b77c32fc0d1c5f2812bea43bed8110d40c6e536478915afd

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