Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7ddbe7d6b44986…

MALICIOUS

PDF

90.5 KB Created: 2021-09-19 00:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d03f1f3f73aa1717ba45bdb9b199c34 SHA-1: f86b6039d576fefdcbafdd4641257e929d5fa122 SHA-256: 1b7ddbe7d6b449864f1101575364b39a5be3be216f7811954960f69bdccecdde
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://sinosteelcode.com/filespath/files/20210902180909.pdf In PDF document text
    • https://santa.my/images/users/00000000/files/wakigorilapukositasebedev.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/pajol.pdfIn PDF document text
    • http://houselandia.ru/files/tedofituxaza.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cr6po2crmkqs9cnnsbqgpflt31/xujeniwagefogumipuzij.pdfIn PDF document text
    • https://aildf.in/userfiles/file/negisomexogukoniteripako.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/99229437905.pdfIn PDF document text
    • http://only-svet.ru/upload/files/14045975226.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/tujetebaguz.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/80640099547.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/nenixewebirodif.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/selilaxoxipixozo.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/zibow.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/takabewobuzotifok.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a504414---3044780779.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/lobeb.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/romekobemaloseju.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/65576239957.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/55825817156.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67d79b20f---67202640393.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/nolebudabajabeni.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/15162065703.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210904215931.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/75947690898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blast+of+silence+full+moviePDF 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_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 18660 bytes
SHA-256: c45ba65d6f61c9cbaa187074a4da852fd1161fe293f54bb15ecb6f26584d782e
font_01_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 10616 bytes
SHA-256: bef1f9e2cbf81beee6aedaf8c7667911baf78c5d37dbc868fc87da7fa21c13a4
font_02_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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