Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea1f43b5e50d774…

MALICIOUS

PDF

87.8 KB Created: 2021-07-25 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bffff3537ea51be43fe652d03e3dd71d SHA-1: bdc87f105e71163e209c19ec33cd9d30a205b5b4 SHA-256: 1ea1f43b5e50d7746cf8890f6d75803d1c9e7e1faa7d6139f3fa0f03fa81b3cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of external URIs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4adbf34c54---93801296996.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7ea7358d8a59118074b95394e32cfc9f/18490605894.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/88000500458.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/78228342045.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/jarut.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6ca015723a5467d76e378fdbf4c94f06/rububufokafiwu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/309442886.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1616c31ug1iav6tmqtco4bc8i1/kuzizadodof.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4t073vgie3adggndd63to6fto0/632240043.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supedarebisetelepamif.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gesosagijulezevoletipoj.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0r304dgr2jhra9uivlomaoa915/dijiguxuxol.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f540f70918---12692176778.pdfIn PDF document text
    • http://hkalc.com/userfiles/bogapetikuva.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ae61a4c4f71bdf8184b8e99880f43004/27654263644.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608475f545680---lakazuvelulifevudunu.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jalezasivololog.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/16839237163.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7697a52468---fojerigujujimu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/i83h6lcp82n1uuqohksmjkon0s/48732024079.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bbc77041ee9508abf77a5198e492499e/pojibikuximoru.pdfIn PDF document text
    • https://laser123.com/geektic/files/ravevato.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c125c183781---wevitodotivatagutubuj.pdfIn PDF document text
    • https://afayl.com/userfiles/file/wawidunurali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+nfs+heat+studio+mod+apk+versi+terbaruPDF 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_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 11248 bytes
SHA-256: 29704a33f98fb3c55696d22af71b0e50ab8c4eb83ebc7eed59994d928ea39495
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 17064 bytes
SHA-256: 40d1a4adc239ff54ff9c5af5994a8e88747cfdf449ec0fe2145eb06914f7a1b6
font_02_sfnt_off00013892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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