Malicious PDF — malware analysis report

Static analysis result for SHA-256 345f2008bb1089fc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 04:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d97e8b476e44306c34bbf83c1dccd24d SHA-1: 6425586628c9196bb901239f83187ba455f4d667 SHA-256: 345f2008bb1089fc843631ca02a206ee4511cf7edc2161a62930362682f2b0af
104 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or interaction with these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6674

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://hud101.vn/webroot/img/posts/files/jizitiruriva.pdf In PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/12642178680.pdfIn PDF document text
    • http://dsfly.com/uploads/files/68405564468.pdfIn PDF document text
    • http://whatdwellswithin.com/file/jeximatar.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4579ef55---gijigo.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/sixej.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/82600619509.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/sirubusadubot.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/34814372571.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/25315155982.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/molomeni.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/46711106205.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/auhqj4e7vpui58l470rv8pk698/76734751362.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/jasevumawipubodob.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4ac563d1---sudaponorodufiw.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5b74580105ffbac02fda4683eb08d25/zukufulifesulu.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/beboti.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/nexezesufikifep.pdfIn PDF document text
    • http://hotnews.md/upload/userfiles/files/59338781057.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/nawesumava.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613404e0e109d---97910319430.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/milorujuban.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/92234315445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=excel+formulas+and+functions+with+examples+pdfPDF link annotation
    • 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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 11156 bytes
SHA-256: dee05fb5f44cc28ac3feadb2b46c8726d05bb32180797f4ca3e7f82742a002a5
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 17900 bytes
SHA-256: f8b850cc7039c550e16f3d1abbceb88edc467df98bdc2eda2181aab4cf29f21f

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