Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9a0858b24672a4…

MALICIOUS

PDF

152.9 KB Created: 2021-08-17 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b3beafc02674428e6996a99118d0c16 SHA-1: 631f6043772ea5f805d64c9bd3687dc84dbd5a21 SHA-256: cd9a0858b24672a4cc129ab547f6917c96e470666ae13675844126e02bad2602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/15960158727.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2472e67---7098292241.pdfIn PDF document text
    • http://tcihk.com/userfiles/89405037745.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c17e4886174---sizuzibiliwipa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5f9c062284eeb77b4eb1e2d6cd840ce4/81083382051.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb5c79edf0.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/57834341601.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mixive.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/85509631240.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/tosifalevola.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1f3634aef680487df026a084b4884bf9/30790749441.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/98275478308.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607035844bb4b---litetaripa.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/31941422477.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/ketadajozefed.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/xitizonimememow.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/doripawenaki.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pigiduzat.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qpe1kn5qq5nnusa75eolagr975/tomajexi.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/35243091921.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2c6464039f6d559b914b8d026f97b3a7/bewibu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1094d272bf---butizixisusebotukebi.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/33220265674.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e75d8475---57627610646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=calendario+escolar+2021+sep+estado+de+mexicoPDF 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://toluca.tecnm.mx/wp-content/uploads/2021/07/alider-3.jpgIn 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_off0001f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F810 16308 bytes
SHA-256: 3c016e71f31303bdb2f3d92823d168d47bd6882532e0fbdc666d71269f3c3b40
font_01_sfnt_off00022105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002391c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2391C 11104 bytes
SHA-256: 2cef593113518864bd2c20864669bb42aca9d90804f7ca587fc4db4d8d329e21

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