Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa62bc41bcf809bb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 06:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33ffaed94d74a0755b59f7f403f52821 SHA-1: 52bd77e9c8ed5db4b0643eedfd9708481cb43a82 SHA-256: fa62bc41bcf809bb86abceaa54047b484201d6670aa6a686d78e77529bf1fd33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the execution of malicious code or the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://katela.net/userData/board/file/16606192613.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bc1e451c---nisejodizakemejaninopu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9g3rm1dd2bln4dj0dd2p4ihpqi/sovomajimobamejexul.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/jopura.pdfIn PDF document text
    • https://wonkingchina.com/d/files/22223278147.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/28897010423.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/pujiwomerisajiwanakeru.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/nuvig.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/37443983146.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/92458890214.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/bunuxelamenal.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/soketo.pdfIn PDF document text
    • https://virker-ikke.dk/files/40841694425.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/matasezobowov.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/guxixipok.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109092112034111.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c089cbfc68---xorowupunajebomojunejina.pdfIn PDF document text
    • http://netflor.pl/upload/File/jolevewujazereza.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/vetixolanutetixaguximon.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wudugixuvaxes.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12066317250.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/12683844630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2017+all+movies+list+bollywoodPDF 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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 10856 bytes
SHA-256: 6dcd26faceffde281af36a9a8356624467eda7e2a1d41c91de0158b292738734
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 15268 bytes
SHA-256: b9988738a9013a4d52519c0be02daf637c71aaa548bdc8f30b90976bc060c4ac