Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2cd99ce485cdd9…

MALICIOUS

PDF

86.3 KB Created: 2021-07-17 02:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e0e8bd02bd3d54d5bd9f9363355d66ed SHA-1: 41a1c5adbdcfb736d71e6fce047bccd027d54e14 SHA-256: af2cd99ce485cdd95fab63af95efe878e664b2c9c6bbf21ebf35c6a009bf091a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. These links are likely intended to redirect users to malicious websites for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f2b01480---55846636654.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/659e3459df9f1b583962393ebd8cd1de/49625085774.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/talogopevonunebupuvef.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/29514924254.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nameweriginomum.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/81792215720.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30690eb30---29442943561.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7bed1223634d2ba1bcac04bd7bce4752/46938193979.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2v27mcaf8jlnp2eu8m1r2iqmsn/bagonelivog.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dfdf6f0d7---nesemebapalitugosil.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c99fde28c7c7ed97ceee2c5b6bafdf2c/15747827975.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zijojena.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wavadulukewaxafaxudok.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896804a1c---vuxudivizevevumoxubib.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/pidiledo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30011078615.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a4f75bb54---73407544660.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/69688761225.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/01eb52c62ce7f6f9f528210057fc86e6/dinigajukovojef.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc066c08f0---3048700936.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/totarawav.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/98132817346.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/90727681816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=interest+rate+durationPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 17784 bytes
SHA-256: 307abed6da00de5a3060df4484a924a03582539026e19b65f5efd7c19c501283
font_01_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 10244 bytes
SHA-256: 67927c7a0f6d070c3fa936f10cdfcce4b83ac40e4808d4264464ed96c9eef074

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