Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0897498daad1b60…

MALICIOUS

PDF

69.3 KB Created: 2021-09-11 12:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e079784b33d971d47611d6d4fffbc5b8 SHA-1: 0aab40f75b31b27c142fdc2fcf4a1d5a61b6540d SHA-256: f0897498daad1b60954295532d58125e4ba2b863e20ed97324c173be3ed849e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://macauroommate.com/ckfinder/userfiles/files/jojewefasik.pdf In PDF document text
    • https://duel.pl/userfiles/file/jikubamomokakamo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6c879daf---jikukawupibukimewedigab.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kopim.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/96406022ed02724c65ae9c25206e360d/dinelibewafesapeduven.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34230550696.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131310dc8c1d---ripufuno.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/sawukikowuwu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/81604334364.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/54095227358.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/somadoxokukisidakudex.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/94908685148.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fekodaleniginuzos.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/80313231338.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/54369893819.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210904_235212.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/34373990295.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/9691655325.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tomimixa.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/72022464638.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/58729261715.pdfIn PDF document text
    • http://planetamama.ru/files/file/69371916597.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/85675543995.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/mukasofotokunepalamurene.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/batotofebojojazeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+happens+when+you+factory+reset+your+tabletPDF 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://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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 14376 bytes
SHA-256: 82f4d2313a4e967eab9d4dbb6a0a26a7c9f0f8754d206030dbfeecd55b8d5bcd
font_01_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 10916 bytes
SHA-256: 31b7b9385b70d3d58f78c192a207f721cedbc9f7f984ba32f75059d9c41113d7

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