Malicious PDF — malware analysis report

Static analysis result for SHA-256 079fd0d95fd0f004…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 09:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 25e69b9e7f0429a6e601d4078c88797e SHA-1: 4a2231993469a4a165dfc5af9f5edd99d167ca32 SHA-256: 079fd0d95fd0f004a163b3e2aefc3c29f83c0d452d98b141489a0d0dcfaa1fa7
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 hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=how+to+open+eac3+audio+in+mx+player PDF link annotation
    • http://selidbe-beograd.info/files/53768055958.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/23797835051.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2520e5364c78c36222fd6f8eb218a12/4815396998.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/jetofulaperigapugi.pdfIn PDF document text
    • http://residenciasanamaro.es/userfiles/files/8842999267.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/55358654973.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/79895025453.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/58nme2llkv2v88i2lp8tode4fi/67856693428.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/82752163926.pdfIn PDF document text
    • http://one9five.com/userfiles/files/pilemeverolowebipo.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/posolosofu.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/85905314202.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/66563246243.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/poborozo.pdfIn PDF document text
    • https://hgb.se/filer/file/fetew.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/patazubisupexinivolag.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zosumu.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/60415138851.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/46326107487.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/95005584586.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130371f8b06c---53950506235.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/79435792276.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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 18512 bytes
SHA-256: 26523705dc30298b9e77d4e288508719bb33e5c5aa016e17ed5c1a923b06f80e
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 11072 bytes
SHA-256: d4317110fb8ebb0bc16c6ab4b73d05a02f6351bb643d0f26dcc2ff5d68b3ebf2