Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1badd99e006d80…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 01:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4b60a35c3fa0640f908d3221a33f78c SHA-1: e19f0f04105af4b2a3fe10b7c7ca96daeb9c1e17 SHA-256: 6c1badd99e006d801747bfda4e4d7387679041271d9a142d60a80c5c30259cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content, potentially leading to phishing or malware downloads.

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://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4ct7ieebsem39rhe2b3rac788q/pilakolumotip.pdf In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc299372f1---farozasokutinepovixo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/d7o1cm8pnahigj1rdn2l225gou/47410134428.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/sakijubotavupofix.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dea0a0cf77d27aff66c5e3a12b4491da/vobapimixizovev.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/miwuxalogesomukavurigu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2182d13b31---lesurawobivakavezabamezu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1ca365b3---sagidudob.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/pofelivup.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/pujitudumex.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/valumemimapotemago.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/ragolaled.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vedotigegejujirokupujapim.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755b096fa75---47717661664.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad42d87064a---tojobupolibaji.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/valabogiwadofimeroru.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/86163094041.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd8195ba12---fazuvufipiwotik.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/jamatelopakexaxusagit.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/ditir.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/63751887208.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7c8582852---82626932106.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec39482f7---85461486029.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/pizakukuwovigeze.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/38608075532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=structural+analysis+devdas+menon+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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 11220 bytes
SHA-256: 673525d6bc9d8ff7772c655bb93cd1518a0d6737caee7567e758554e46deac99
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 17840 bytes
SHA-256: 4b9b8e24a3d28f3b7cbf5ec90d945a49ad145d579e42d51046d301304809f43b