Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13da7a78116589f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 03:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4ce7d3bba7be348c7096f99d5aa039d SHA-1: 4cd2e0b45b31e4d3e48c7f76779cb1e07309e013 SHA-256: b13da7a78116589fca2c0c9eea3f586d468e3cc1bb630dfcf113327be6296044
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, several of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm structure suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sssmri.com/ckfinder/userfiles/files/suxamefonodage.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1a6124debc89b95ac0a7dae69e0cde6b/89261129703.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/96849992618.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/nofojefebuw.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202197419144950.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/35399781605.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/65183114846.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e08ebbc6---sotib.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134407392861---nopozesexiwajobala.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/34442581872.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pesafediwej.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb29b1afa---najoxemanikexuwirona.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109042007566483.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98574405462.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/labaxeg.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/77751738800.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/16753727709.pdfIn PDF document text
    • https://sadex.pl/fck/file/losowojataxem.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/85007104781.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/jugejavo.pdfIn PDF document text
    • http://hk-keber.de/images/file/pomigewasarofoxiruzifof.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/42522113034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cute+font+style+copy+pastePDF 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 10524 bytes
SHA-256: f44cbb90a98f688c8d35f5b0470b2e8d5be03198561bdd41e8356d856ecc2cbe
font_01_sfnt_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 15924 bytes
SHA-256: 58b64939cb5117fc48b45c49ec2e223386d3f9d3241ec4ec8c3344c018d689a4
font_02_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1