Malicious PDF — malware analysis report

Static analysis result for SHA-256 e299e7e51d1077d6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a6fd2c757d184331e4991b175ebae82 SHA-1: f73ba74b052c7cad1a640034689c18879698914c SHA-256: e299e7e51d1077d6129d21bed3e40dd10d0de0b58de5a5af5827f596ef254b84
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'Fake invoice / payment lure' heuristic indicate a social engineering tactic to trick users into downloading further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=passbook+for+android PDF link annotation
    • http://zekejozsef.eu/FCKfeltoltott/file/95742964093.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/17591991094.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/jewubirajakoz.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/59151143571.pdfIn PDF document text
    • http://uco-kampen.com/media/files/tagorejume.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/15203340830.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f2922705---pixosuxuxi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/mupomovexo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433d836389d---72089393767.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/24822853206.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/xunabebubinedesalodav.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jj7dfl5bo2onj8lbm21jk741hu/bubes.pdfIn PDF document text
    • https://wildnaturetravel.com/File/89827811670.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/54973516044.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac22c2d60---48335656044.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401e289fae4---28382019387.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/zifosusuluzufafub.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210911135717.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/5184468568.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/45926282740.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/98024718865.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/korof.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 18256 bytes
SHA-256: 345e938270d2eb4a101fc9591b183fe34afdca2a175bcd50d661d159d280a8e9
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 10304 bytes
SHA-256: 58505aea9094f95c77b96198a064dbf6c7173e70179a3de97c56e707a1eae4af

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