Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb93577d17bf77f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 22:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17a2d4c7dbac9d1c5b85a5334b1fafd7 SHA-1: 5c289632f7cddd00724023d66325ed4799a2925a SHA-256: 5eb93577d17bf77f0767e4a34ae1afd18dd2ff2e46ab218fe96eb7a3b8eb62be
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=watch+tamil+movies+online+free+websites PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/95076493956.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091802095484.pdfIn PDF document text
    • http://rvhifi.cz/files/file/kiduxezuxav.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/loxulu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141c114b327d---82127236941.pdfIn PDF document text
    • http://195exim.com/datas/files/35299971487.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/zelurujukowax.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613491504a206---34908720311.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/18235827532.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/nadinopiba.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140848fcd94c---rizeduduviwuzefurezubuta.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/tivoreboseviboza.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/wupurinunazutugomesukomu.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxexogalolawevopavozu.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/pubigefejogu.pdfIn PDF document text
    • http://besteva.com/upload/files/mofari.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/95224613144.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234819101.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/77538759098.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/14812353221.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/sewubum.pdfIn PDF document text
    • http://calisnt.com/uploads/files/71965488430.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/denowigeperaxuk.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/12112074033.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10884 bytes
SHA-256: 84e8db8d6ce3147d63f016338030d44db38a331a4754fd43fbb48309bfe7f62f
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 17272 bytes
SHA-256: afa9e5324d29139488e69708d1a1f66f0ee1cabd9d38940c8f4d0b461acbbe80
font_02_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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