Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fd11e04885a938…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 08:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b69e090f9aa6cfc2203c86165877930 SHA-1: 0d149ef970963366417cceaa3685dbd42fb53d77 SHA-256: 50fd11e04885a938377ed7c419861bcb1a6b22c66b09d0cb7642f1e196473fbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ketchas.ru/uplcv?utm_term=lost+vape+orion+quest+manual PDF link annotation
    • http://kingalbertltd.com/uploadedfiles/file/mawiriwekuriku.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/fevazinenix.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4rcr208l6ij6mm2hib27tuctkk/59270186348.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/94687212380.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jerulidebepedu.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/xesatepodotowe.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/lalasefupikovugemoja.pdfIn PDF document text
    • http://coolscape.info/images/files/ganuvodawekivumitav.pdfIn PDF document text
    • https://actorconseil.com/files/file/femetas.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wokugodimeruzu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/p2rd4qmakrlmdkn6am3u7nqgs3/wakuluxufivimufokelopuro.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/22301185710.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e8a57d73a1fab143734288d222b20f3c/20594719653.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/30191326971.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/kigabagazetovif.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ba8237c09f29480931551988e973610/51122812536.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/98379220663.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160852c6f588db---31842814982.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///82391372480.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610eaba0a9751---89231365174.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ac43799c66201867aef050cc84bb4544/ragomimadanesam.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210705071543.pdfIn PDF document text
    • https://biocoils.com/img/file/virojolegis.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/gejedowesoz.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/xepowux.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/duruzudigaxoxenerapa.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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 18128 bytes
SHA-256: 19a003adf3c814ed0a1507884ffc44651047c6f5e51ced298fccb8e4d17d8632
font_01_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 10680 bytes
SHA-256: 75967a95f82238e30e85c86fe19510951e74ee3fbb9e117bb6b5dbbb12a339da

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