Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8919b71aa93e61a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 01:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 184d426b8e6e4669755340fd59198c94 SHA-1: 1e4c59fd1b0fb9e36913fabc3432e1e57b1ece6c SHA-256: f8919b71aa93e61a7ef52f873809b7c3c56ce8596978442f307196cb8c18a874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm that directs users to multiple external websites, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://liepasmuiza.lv/userfiles/library/suzapefiregibise.pdf In PDF document text
    • http://bjdfszwy.com/filespath/files/20210917081054.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/93396768307.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ogls4t8pcv7p9qk58thj7f200p/68142103609.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/tesikurudazime.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6ccd7adddf75deaed31aa3ef68e44c28/7388185907.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipusudovem.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tifigij.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-19/20210919165540664453.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/33775845639.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/meturutikobabenorum.pdfIn PDF document text
    • https://podimercrm.com/img/files/fisufonako.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/fipixaziw.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/pavozozininonajoteweduje.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/xizajij.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/xuleritovob.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/74660195087.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/2750385417.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/dubumibevoxubujer.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/99953374344.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/fusenudunegologesokeveve.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/35287958bc17585b7c58a85cf2a1100b/pugaganebapebunimalal.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/xepijagebobodeveparofa.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/76085834531.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c029b4f7ec---65241736630.pdfIn PDF document text
    • http://boki.hu/editor_up/tebajifojipiwogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ipad+air+2+price+in+pakistanPDF 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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10504 bytes
SHA-256: f3b58705b90dcdf465649509012bbecb4a03f7d341fb80c8005f4e66a85fbb01
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 17176 bytes
SHA-256: 02d3949ea9e6b587646682284ed27e3c8b11c14787092b18d0ec910946af973d
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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