Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d46a1461f3abbb6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 13:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58754f462f05ea02387663ea9cd0dc5a SHA-1: f89abb034561e0737c49e105aeeea9775f9d3562 SHA-256: 1d46a1461f3abbb67d4702a262060c7a512ffd8f10137c50efe04f1808d8ce9a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the presence of external URI links and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=psp+games+download+file PDF link annotation
    • http://digjamaica.com/app/webroot/files/98864269023.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/82487657303.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/87101662596.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/13201309348.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144de80e57dd---torevi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614239e823fcb---20256379354.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/puwazuzewosajikaxa.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/jezusuvesubimaputadizalol.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/95182537296.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gafejixos.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dcc80892---pepinasal.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/laroroxisilin.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/57436959548.pdfIn PDF document text
    • http://canvangdientu.com/images/file/41016126717.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/vozukefipir.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1535c1d81---fizewakapajuxufaweno.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/zitevufabi.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/1311984941.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/lipaxunuwinudezonu.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210901060824799055.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/rawabuzi.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210911_CF1B86C6440260A9.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/51559168829.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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10732 bytes
SHA-256: db14d25c6291fe88d578b27ef3a8898fb31a0571dbd126e4cd256f09694f9562
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 17756 bytes
SHA-256: 90a22a488e9c351f8af1c98a68a3a9f5f4cfdeea45225d6742cdf0a87b7dd537