Malicious PDF — malware analysis report

Static analysis result for SHA-256 a391d96d14b2b1df…

MALICIOUS

PDF

89.0 KB Created: 2021-08-11 20:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9aae07f3ae2720c9c98c4a83477b422 SHA-1: 90f81b36f8a27c2147737d04cbb2d206069faa25 SHA-256: a391d96d14b2b1df0ddd669d66306993c8bf91142675c6cc58e6a45467a6167e
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=what+are+the+advantages+and+disadvantages+of+outdoor+games PDF link annotation
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/bunivoromemevubomitope.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/fujemazipiwoz.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pavafugezo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fi60f61db76q0fcsbk4468se16/marowo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e363c1059486ebc630848c14e7ee2dc9/18548076349.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/tulizakasumexapi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf79bc0ea6---nirazilirexerurejamizava.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/36152980765.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/mobukaxejegoriti.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d856899cd2---56313661431.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kegawab.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3ea108fef60e847090326a97027c4f0b/56669738187.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ml8dsoqvcfv125k9jfslbrl1ol/fevuf.pdfIn PDF document text
    • http://stylekd.ru/files/57581581543.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/23349956653.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176a37f82d---luliza.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d119424d8---mudumigowika.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091303819218---24731578663.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/jipuraxazuxixuz.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/68928651359.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/28953005117.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/wugolotapevag.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3d920e0d797f8e741a044035dc7d24c1/kubilov.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/papagosodoja.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_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 16360 bytes
SHA-256: 6d588568a909c05347680f935ad8c24784a4f091fb339cf52bf5ca60fc8f05ba
font_01_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C05 10916 bytes
SHA-256: fc8cd612a0573d2f7b8446a2ed3495c962dc6cfe4c5bd9331b733866ecc13549

Open this report in the interactive analyzer, or submit your own file for analysis.