Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd940df5998ee732…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 11:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad4a64ff2c193da715308d3c079c6c8a SHA-1: 70af7f7a298d98344cc0718bece32aa5d5d14472 SHA-256: bd940df5998ee732c583e9a69f75edd2549bd616bb6f7e9be05398beb3c64d69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed to redirect users to malicious websites, potentially for phishing or SEO poisoning attacks. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=capteur+de+temp%C3%A9rature+lm335.pdf PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f1dd0da54e56e910b2a9b9c62551e7b1/setitum.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d559fa6dec79a5605aeb9e4d33342211/janoni.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/75471709043.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/k92ma4t8gk78t5nkpvuj1ae4q1/2480197076.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/tovasibefukukibazitab.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/83817192437.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee0a160098---43738863010.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922783719e---nijoferogapotamafafamivi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/javemuwim.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/mugewetidami.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d783703992b08b73ac6943afee131c2d/zirabilatora.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jofodisilajodefotitobok.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/bezigenunexuvotirowof.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608212457310f---foxalitikizij.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a561ef3---kuwalojalusew.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/rilupowadas.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b8acd175310b808f10e693aec38412c6/noruxiteg.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zuxidodofazuginuzon.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kikezovelozatigeweraw.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/816779bd71124bd3acf4d7192c8a12a7/paduwawuwukekofituk.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/90630517170.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_off0000c6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B4 10832 bytes
SHA-256: ce44c709722e27b23e10a4dc3b91382606a706ffdb97db9af6a3ddddda1dd56b
font_01_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 19604 bytes
SHA-256: b270c522494fd163d5e80e5f5a3324cdadee272e7f70b72649b5e6afc78fb23c
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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