Malicious PDF — malware analysis report

Static analysis result for SHA-256 144d4f40bdbec697…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 22:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98d7a7b1c4620af78fd0731c2b5c02df SHA-1: 236d0d93c26675f141d064f6256166fd9e1c4c2b SHA-256: 144d4f40bdbec697e607ac15e56128fa65c3f864752ad9b81301f09b77d62f44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript further suggests malicious intent, likely to execute further actions or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=justice+league+2021+movie+online PDF link annotation
    • http://daieimotors.com/js/upload/files/30352062644.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d86f9db62---bekorafamid.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/putiguro.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/71039382903.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/lolazaxudokizedawe.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/gasuluvuvojari.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/vuduzujumew.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3bl7i5as8q89jp46o6ulspjerp/54283972431.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bfc3hvl0ksfaq6oka6inuh3jh6/ranujipetadixasab.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/rimuretef.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/pumanigasuzurubu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xituwuzokalititavirug.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/gupisa.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/6862446192.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/lenafugeforipafur.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/8003672425.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/64010860049.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/12fad783e0096d460d2ed0c14e6349d5/medenajaxi.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/40148655972.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/82512135912.pdfIn PDF document text
    • https://sapporopools.com/contents/files/rusaz.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_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 10924 bytes
SHA-256: e94547d6a95e6a486336233ccc4c3dce92f9c47a107fe95bae5e248405875aa6
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 17144 bytes
SHA-256: cb6ccfae2ccd9d151d3c3bdadaa382518f9730bfa94c051a8c3514c89ee6a36f