Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe34fb5ab5c6fce4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 00:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d5181546ec8f39cb14c079da7640206 SHA-1: f499076c8e80eded4997c931873f9f2dd793c03c SHA-256: fe34fb5ab5c6fce482d3bb333b48f151ab6ed7999488ce50cd121490f7fffb51
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript and a link farm pointing to multiple disposable hosting domains suggests an attempt to redirect users to malicious content or download further payloads. The primary attack pattern involves spearphishing via an attachment, leveraging embedded scripts and external links for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://villadorottya.hu/uploads/frontend/files/61581118405.pdf In PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5656269897.pdfIn PDF document text
    • http://fygl.net/uploads/file/150833143214.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210731_BA1107AB69D8A91E.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3e2973c98d10729596ed024d69f711e5/judipibupipajaxakajobizez.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/paxefefinosuzad.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/fezog.pdfIn PDF document text
    • http://ametansk.ru/uploads2/30939756182.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/dofodujitezejujotepimago.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/99846043687.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/973597378.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca3ca3b36---giguxalafewax.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/81088242251.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a004a7a189b878efa5da04425d4cd745/talotuzafimetajaxojuxex.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/gufizozakolojakejup.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/dibobidokimirozuta.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tuguva.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zejokixakolug.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/wewaxoxefulew.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/sevizomigerikok.pdfIn PDF document text
    • https://starbox.fr/img/files/zumenipofefavezilujekun.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/gipexoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=les+glandes+endocrines+et+leurs+hormones+pdfPDF 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_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 11124 bytes
SHA-256: 1731f68e265d144594c574bd61b40b4b67871194e30f37cfa583a1a355bb96e2
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 18808 bytes
SHA-256: e8725362f1a726b7e7329a0a3eec6c6d86ca49fdee90ec689a7e3c2562e56129
font_02_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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