Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe8d7599cafebd2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 12:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04386cffa6104874236653e9399dbd2f SHA-1: 8faf4b9cdd8f33f4b46acfd6c7419c0a2ba2aa25 SHA-256: ebe8d7599cafebd2a80ab23367063afca4171337538be26d36e15fab76ea04e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, many of which are flagged as potentially compromised or disposable. The PDF structure suggests it's a link farm, likely intended for SEO manipulation or to serve as a lure for further malicious activity. No scripts were extracted, but the PDF structure and link farm nature point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://denis-lefebvre-services.com/fichiers/file/pebigetupakedabisof.pdf In PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/65816673459.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/37034872991.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/mapibuvilupegelivuxogeneg.pdfIn PDF document text
    • https://goodline.by/userfiles/file/sutubosuzobuwep.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/92272758824.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/66da589fa3e6ee3f2e33ac6f98af9438/bojubakorobajinagorekud.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/saxuwopetifimosul.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/pajusasogixewuxozup.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/20290292706.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/sevevubobajabapidofejupa.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/26786381825.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/43507140594.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f86202cac---61488672636.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8598f90d97---49104959596.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/17585724386.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/16810662344.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/b564e2901d64fdf5c0ba247e8d1194f2/8288677199.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i4ctt11fpt7ahj4fc48f4ohegu/badim.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/81471942037.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/54192950296.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160740b4b51de6---ruxukatujinufij.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f389fe7ac71ef5d7966a8f1c01cee9fd/65591916435.pdfIn PDF document text
    • http://grimastone.ru/files/75597097311.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/htjktp6gfokcjo05t2phecnl6h/27923367472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=3+storey+residential+building+design+pdfPDF 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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 11100 bytes
SHA-256: 3d74655e85d70afa73eba5d70dbf3a24f39382ad3e9fc276ae520748d8e7ec2f
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16772 bytes
SHA-256: 1e699c8aa34673dfca748ad2cfa26d8ad687646982dd60b6120745e69fc9b162

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