Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90035908136a59f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-19 17:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60879c0d71e9052707930d2859cd2efb SHA-1: edf69e8b65f250c7e65910a867706632871a02e0 SHA-256: d90035908136a59fce3bbaa1666f00bb78d54c3927448dbfc79d502f4aac8378
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411c7ad8280---guvakobubutorolir.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/41058650036.pdfIn PDF document text
    • http://intersonik.eu/upload/files/tokawol.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4c6jo7dhngg3pg3gon89np34oq/kagiladibesavogeromore.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xiwokibedaxe.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tanapediwibipogumolokamok.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/lolutojeneforari.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/87076543850.pdfIn PDF document text
    • http://talesma.com/E/file/zilezutitokug.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/kewizusizona.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/55696645947.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/sefodumepawoli.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/demujiwup.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/70516473978.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/3461765825.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/58390109459.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a50e6aa5---49923557461.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/76001131032.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4aa07257---gazezofuk.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/zofom.pdfIn PDF document text
    • http://www.moyekolodin.com/files/88654608523.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/44395064662.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/fixozawofurenokudaba.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/sevojetoj.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/zazejedinukarenisov.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/46569214042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=thomas+sowell+pdf+downloadPDF 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_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 19756 bytes
SHA-256: b832f5910be98c8abb8192148bc3aa87f477c5ca837ac9f41bb07937fec6d150
font_01_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 10520 bytes
SHA-256: 8d0da474ef9b7348fdc2f807fe555022fd8e0991a38aba522109c7f2c63dc4c5
font_02_sfnt_off0001551e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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