Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f871d500019268…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 09:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15545d074855c7c0de24ee1e730f2985 SHA-1: fa19949d69db2d4b56567b64d98cb424d59ea31a SHA-256: 16f871d500019268611b5fc288a4ac03e55f855be5c980194b9a376d404cdab8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple unknown URLs, indicating a malicious intent to redirect users. ClamAV detection and ML classification strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or payload delivery, while the link farm serves to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://centrumschoolka.pl/photos/file/vesukixebuvowu.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/tinefuzaxuv.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/70250089051.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/64543182511.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/93810530473.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zixediker.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/sitevo.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/pixuxix.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/robilasanususasajonubuje.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/97556742150.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/96971487829.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jodeganevowewima.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/12422562085.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jinutavagabudujisaxevar.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ca6194b5---fekedevizenasakok.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2549759db---64071150409.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/56588074387.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/bigijeniwake.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/54164194861.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3399fe5f8e1c61d0e06f6d061b747ac7/wejulazeso.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pomurivifefekirerufu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/924c96c516e60f1b6485b4353a5de319/3773995586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=word+density+checkerPDF 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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16884 bytes
SHA-256: dd77fd4b79bf355592ef5352f5d7437b8f322cb489002afd05738ad3372c7dea
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 10456 bytes
SHA-256: ca8c69dee291ad84517a2496af274a1d7faaf8f0c93c03a799fe3e24ddea2fdf
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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