Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e192a39a17ea064…

MALICIOUS

PDF

74.2 KB Created: 2021-10-05 04:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a992ce171c6c3566729720f1e67f4901 SHA-1: 25f0a61b93853d316668f759ba8ddfe4e1e1af17 SHA-256: 5e192a39a17ea06414835287c6ba44a9cb5999d7ca4820a7dd7172f6d8932ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external resources, which could be for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=the+hill+restaurant PDF link annotation
    • https://klaipeda.cvzona.lt/resources/img/files/18148884195.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159e7a71523d---53720945087.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec64b8aaff---zomosonef.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/wesoxolok.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/zunibuxifugisokebosa.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/17395003824.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/64979572899.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/23219093980.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/50e9ebd6de691a7af6738303a3ad55d9/kasabizogane.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/pizivolo.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/18058385985.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xufuni.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/dufakus.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/piraju.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/2410572873.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/jowewuv.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/40968652148.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/dekusapavevazexisirug.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/bepewugijabunevezow.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/10987517150.pdfIn PDF document text
    • https://betsin.org/userfiles/files/50740149917.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/lekupave.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/27611317470.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/4413380787.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fjpa6bjr92n2lbjmi6c8l9ubt1/segugokodifavezufuxebib.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131cdc283202---20837714941.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_off0000bea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA5 17800 bytes
SHA-256: f0479cab7db445664d6f6814225ba49701079f334587e1f97a9084a7845f1439
font_01_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10148 bytes
SHA-256: 1e00fdbee94abbfb76403f190bc322517869ae662a092c97c9f4343db17b9db5
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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