Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126fd27aff0b9d3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 09:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6774573e4e71f38afeefa667f3f8faa SHA-1: 87ebf19b8583d7dadd4ddf711c9f08f775c2b0be SHA-256: 8126fd27aff0b9d32a14971bccaee267d29dbfe157c4dfb7a3c43bf6ed4733f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://flixgolf.com/ckeditor/ckfinder/userfiles/files/xamafexutuf.pdf In PDF document text
    • http://t-eamplus.de/web/editor/files/88493232460.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f00175ac6c52420d4a94cbe64f49cfb5/47726628768.pdfIn PDF document text
    • http://gnox.vn/upload/files/wigutipimimamebas.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33081585372.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a84f47e13d6c092aaa64adf3e22e66c2/31967638826.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/48772120632.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/24471699800.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xitabizafaribezagumaga.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/megimowuwofeku.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/61798263211.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/depovapijim.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/ribajelurekazofepika.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_14_03_29_17_7138.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16152175ac9909---80866957775.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/digilubomexawe.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/dokadonajunumovaruninaran.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/71784507596.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/86857495383.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/782rn81ckuaa5o97g2rib1pdl7/nemof.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/18847828345.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/85995229938.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/56545654872.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/7962091710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=drtv+android+tvPDF 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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 9960 bytes
SHA-256: d7c9e31b970d5c9fc462c6cd307ef5ce3bd5764e15de16e244c82c804e40c7bd
font_01_sfnt_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 17304 bytes
SHA-256: c79bd2f5fea8e68d7dc38ade3078192a9c051955247cea3bc883b07c6ea849fe
font_02_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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