Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e1cff61e4c5530…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 15:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9884284f4b467e97b66193f1cd9d2d52 SHA-1: 6273c6bd0acc35f557c0d77718505dc0c2a157c2 SHA-256: d8e1cff61e4c5530e622c8a0492df6e15291d65b5704d922f91e02acebcf055a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=atomic+structure+schrodinger+wave+equation PDF link annotation
    • http://orem.mn/uploads/files/texag.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6814db08b---fixotosavakoful.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/dizobogoj.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/rotifokizajepuw.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/65426306017.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/sidilunegojoxov.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ae13d511---nuvixopomatev.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/75226215270.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/87198721599.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/64243614230.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/43507922419.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qm3moo3ivmmdcvddvdk1sc17c/dimofoxerijodofum.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af57bcb08d9bb11fb48c75d965cc911f/gegadujexi.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/85934860133.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/87168414690.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/bomaxetilogixusexuduzus.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161373863591d2---faxiwirutuful.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/13764131724.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///rijivaletesopu.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/36309432020.pdfIn PDF document text
    • https://cardolf.ro/files/27439770777.pdfIn PDF document text
    • 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_off0000e318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 11152 bytes
SHA-256: 16111860af0d1a1e1ed846f65a905aeae4ea2f7394ed371f7ba793b5e1a68530
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 19276 bytes
SHA-256: f9d6875451d499660462cf9557ab6f834349fb09bff65eda79e7021f62fa5618