Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0367898d4415b6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 14:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43ebef9096906b4476bc1dee04aee63f SHA-1: 35c3c4e8a80095f871e36875ffee0e04daddb34c SHA-256: 4a0367898d4415b63c91b5b170fe6a6bfabf94a6eac99b0dcc6dbc800c4c7347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing campaigns that use documents to host links to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=fundraising+proposal+sample+pdf PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/aff9d9850ad0ee042bcf49c7d2fa48a1/93351171919.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a494f8f9481ad328e6319f1c18665be4/67128301780.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/96786990575.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/gezosem.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4474b2b3b52ab1e4587b1f15c79b94c0/60679152962.pdfIn PDF document text
    • https://windsbs.biz/files/file/76782543816.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tjqlh3p6coh2tqch269t5u0pu2/99761061127.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a9ac06d38322d702b13c16df83069020/10623711354.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kizudapoj.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/bunomunujozamukukipenin.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/81661880108.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/murabi.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/linhkp0jmta4a52p2q9vcolc2j/52933177592.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zomovemureliser.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/54959573886.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/puvajilosabutali.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/un57abhk1d78ben7f395d4hgo0/76379210777.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/fitadoroxanezivexupewon.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161324e73c9004---kajexadiv.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/24528456376.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/maguxosobidodumu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5046295e7e---wajasinonawanomivutole.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c99548ca9ec---96885631840.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tg99jvnj3s4dvq6h6du56s7eln/muxape.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e081112e9---sowunutugerefajumosoxevu.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/61683748690.pdfIn PDF document text
    • 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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 17616 bytes
SHA-256: 6667880ddbf941fc66003d6846e9bbc105bc0bd5261293442328f1b5c9e256a3
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10820 bytes
SHA-256: 46671654155338859e80c15e27485b833bedb93f9cceb00b6eafafeeaecfacfb
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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