Malicious PDF — malware analysis report

Static analysis result for SHA-256 685d2aa5a6a69b21…

MALICIOUS

PDF

101.3 KB Created: 2021-07-21 20:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15f148f027cfea1a157f478647d43657 SHA-1: 68109067abc43b6385be201850b8ab554561d482 SHA-256: 685d2aa5a6a69b210c16a12b0313d13e70de0a409f9f87823e5d456c4a405464
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://mjsolankifoundation.com/fck/imagesfile/pizelorugipawem.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/de3d57919aba436334de162dafc81af3/84391705582.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7ccff907c895e711fe31f00ff47faa75/1328201576.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f616bd45d0---vavofanulitokifigulu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jrm5npba2tj5tm985dkce3jniv/46473679881.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/31nae3k6cdejdkqmt26j50t98e/56088198575.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/julutuwegelogaluxafekag.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/guludosajimipojig.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4c48f3b2873154e57a970e51233c9a44/zebuxukulofasero.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/tomejuwosewi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/67b49e7c8131bc9d0aa30b334f378926/85174595286.pdfIn PDF document text
    • http://e-hane.com/files/xizetomuwotol.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lolegarinav.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8dfc8a9a---sobupetezakol.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2432db743d78b69b351c561c495182fc/87968230367.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5be32b81d3---73369361399.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/58084077607.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098a71b14fe6---kenivumazeroguti.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076360caf309---zomoxazelufulamopej.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/50209462012.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/gujaxegataruditiwogunow.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/776f3a999543598776696039d168652f/66913484181.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/vilafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=negative+number+multiplied+by+a+negative+numberPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C03 10844 bytes
SHA-256: 2d63a43b87cb3ef685d5cef50c0433d7053e4540913c4dd98646e5417b437fc2
font_02_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 19368 bytes
SHA-256: c176fa3b6eb5ff1b97d83d737f25817908d9f7dc2c068230813767637275cf1e

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