Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faacd41dd7736f1…

MALICIOUS

PDF

86.7 KB Created: 2021-07-29 23:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 995c5a23674939067eafb8b8bc26449f SHA-1: bc902f0d680d3da518ee0f447dd74d52c3ede94a SHA-256: 6faacd41dd7736f1c569e3ebef148adf60ba017a885e9733fabb747c0f6d4dea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a2a0f4f5fe75dea3516a763899a1b804/94217017811.pdf In PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/45337801480.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/40071619020.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/95519999342.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/73683227238.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813520c00c2---fusuxokup.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zimuganamutodogixiri.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb963b7ab---99783449184.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/873655c8d0704ffa9e86891843afa846/ditul.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/ruzab.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9af67a199294c2bf40c284f4d1be8637/74876835562.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vunogetigusuginulawozes.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/c66f53b6d63d7067f3f64e6091d777d8/15495006248.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/6ap3900694r28buio1ths9lll0/wojowobipazede.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jitakipisekorijeli.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/2475266841.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2d097813---bomizirilinotesibu.pdfIn PDF document text
    • https://magatek.com/documents/file/kuxomawub.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a99cc1579---44810545824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=organic+chemistry+sn2+reactions+practice+problemsPDF 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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 11220 bytes
SHA-256: 8a6b25bd7318d108afa6fccadab2ae71e84fc0c20f18221a59b7b46bed2c2ee0
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 18328 bytes
SHA-256: 060c28792214a0b6b6ffc029821517d0b3a3ded973fa5b5f1282e5075247a0e0
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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