Malicious PDF — malware analysis report

Static analysis result for SHA-256 663c89591a7f98ac…

MALICIOUS

PDF

107.9 KB Created: 2021-09-06 21:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6efe0d33f00fae260ac61fd50102323 SHA-1: 26a8587392bf82ef83e4d13cd5acf5fa7a17425c SHA-256: 663c89591a7f98ac3a21de4507b5c9d4d486ed94e1a9d2200f2fcc35cf5b52d3
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to trick users into clicking through to malicious sites under the guise of downloading academic papers. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://artgreen.vn/attachment/files/84916081072.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/dowuwinorupajigazalaf.pdfIn PDF document text
    • http://greenld.com/userfiles/65687933755.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/wakipozavebofuvisune.pdfIn PDF document text
    • http://www.siposferenc.hu/html/9112082149.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77509177749.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/miriru.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/62333399560.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/patagejobuviji.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/63222782949.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/waduvarawimeritufatoboru.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/12478760782.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611827047735d---99689875483.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654c6c8405---suleziwabiwikeguxolarojeg.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ff4ede388b4ae275240c7295abe99ba1/zelizusuvujokaza.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/37639758473.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560deab64b---zawodowupaxamukasuve.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/39554810009.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7590d1acf4---17196430396.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/85101387110.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2c219d98---pusarurogovadinazi.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/wigikixu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/vimoniko.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zeregato.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/26454698781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=essential+orthopedics+j+maheshwari+pdf+free+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 23416 bytes
SHA-256: c797b0f821c76a7e36688e05094705ad81cd6d59e78a8f1e06b01108c4d738fc
font_01_sfnt_off00014c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C55 16660 bytes
SHA-256: dde419bd77a99b486e4b3f3be42392c3d93ac3ab32a602df539b2aca46717d94
font_02_sfnt_off000163aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AA 2504 bytes
SHA-256: 466f152ce87f6f2260112a703b4cc83c4e7931fd070bd3e8212030d2aabcafa3
font_03_sfnt_off00016e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001868d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1868D 11084 bytes
SHA-256: 8d577fe129a69bf57162998b7dd94bc8599e0f69bef0c3865f421e11b657d624

Open this report in the interactive analyzer, or submit your own file for analysis.