Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93d4548db910d07…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 05:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d80a154ff6c49fe62bb67b3d579270b SHA-1: d0843ba85511cfd504185b33b956ccff32dffb61 SHA-256: a93d4548db910d07f3c1f413cf9d341565dc1d0d3d38c2791083de80101feca2
156 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to various compromised websites, masquerading as a private car sale agreement. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. The document likely exploits a PDF vulnerability to execute a payload or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad794187cc07f991b570ac7e1803205f/80918546896.pdf In PDF document text
    • http://eros-arena.name/eros/userfiles/file/28312619984.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac619b885---kuxaxozizapovujo.pdfIn PDF document text
    • http://budka39.ru/files/31908579431.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/67848913307.pdfIn PDF document text
    • https://sapporopools.com/contents//files/88943844218.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/341678aab2b7f1e7ac317bbde4301b67/gewoles.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4d9maa29sa4kdjmvijuholidb4/84292884927.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/nikenegakuxegofavexir.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/761cdb3cae22e91bb99822847e9eb131/rimazesegebemelikegovifip.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zixuna.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/15437096882.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce831f372---78080364343.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/72884387849.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/jovuwexipe.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/49922444347.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12869607983.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/bofuraginazixi.pdfIn PDF document text
    • http://www.heksan.com.pl/file/depabu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997f84c9820---3174606246.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7pn79p0pf38u21io0o6ts987f4/61966631994.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8630e872c621f20e2845ec73fc2b0546/15136784163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=private+car+sale+agreementPDF 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD382 10520 bytes
SHA-256: c14235cac987d5f8524f6c9f81c6c8cfe61867f349bfe31604c419f5eba87c8c
font_02_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 15404 bytes
SHA-256: 96418d0db618e57980d7de942d5716500ffc8d6fd1a366aeeca9af1bfc570917

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