Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea51504e8975724…

MALICIOUS

PDF

88.6 KB Created: 2021-07-15 19:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6295f8dfdf93fea71aabdc74ad2759ec SHA-1: 2dc7cebf183f07547b6f1dd584610a6d5ab1406f SHA-256: 2ea51504e897572423a7944163a6063ec2ee5ccbc1cde2f3ace39a91313a9c79
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload storage locations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the link farm heuristics and external URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7ebfb271bfd55406b1bce5c08f7a6864/57297824933.pdf In PDF document text
    • https://actorconseil.com/files/file/nikipomigeg.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/70948236491.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/41329557494.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/4978799002.pdfIn PDF document text
    • http://ahchala.com/img/file/68365873917.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc3b50e37---nisonuk.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a227884bb6fb68183499b834974cc1c5/23861765218.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/176ed4b7e7b7e6cdaebf40ba51358ef3/43887837913.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2t9l4e8oefl8klq1gd6r4ccum/zirijumakanira.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fixuw.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/zerizuzabol.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160790f7635d8c---76342715960.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210705022439_1i93s6.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75aec7396---tetate.pdfIn PDF document text
    • http://accronline.com/userfiles/file/90766800562.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/ronasimomipabalafabelekab.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a738396faaa---92402057720.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f5ba377fef6c6807401892631bb3d727/47616813384.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e443dd3a9ba1b4e6cd53b2210efa0edb/45520797969.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/kaliledubidajetifebo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/73dbe10d7c4c5b6e8ec3d6b0e0d7f958/57970818348.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/49a1c2a5405ab2e34694ff167dbe7568/zisagowetojojirete.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b90988a52---zawij.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0sb36miosfrva0rd3k1700q0oa/81425042719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=elocution+on+health+is+wealthPDF 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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 16576 bytes
SHA-256: 18b60aa4b081a49f8f6eb6cef7bba039f4259b4497da8eb402f363803a955262
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10396 bytes
SHA-256: 66211cb95bccb7ba0267789f2cf1b5e9855cb4c25fb8626fc979dbb6381252b1
font_02_sfnt_off00013b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1