Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ca041d0a6cf9ef…

MALICIOUS

PDF

87.2 KB Created: 2021-10-07 21:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e4d13f72094b4d069f0906972e0fac2 SHA-1: 040050a80a132a55eca5461aae436e0b89a3fd86 SHA-256: 91ca041d0a6cf9ef042c7e80eb076964ce7b4da849f65144405d2276af74bf6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to obscure the true destination or host malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sogelec-eng.com/files/ckfinder/files/14066878750.pdf In PDF document text
    • http://thermogroup.ru/uploads/files/84346459197.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/midivejolirugutagomiloj.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/fidalogamukedesapiji.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134335615d2d---36941650370.pdfIn PDF document text
    • http://alltechsro.cz/files/zisimawizabixuvexeluwu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa9fa5e31---4789155724.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/xafixedemetilulimawax.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/636fa14b21ec53ad6821fcd21555c93c/37070421122.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/28175147646.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/gojevilederatifewuboxima.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nusodakotipowedewuweme.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/vasoxajejesixitamoderasup.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/85121129000.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tufodumirowi.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/53870308730.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/xobatajuvupimun.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/pivawixevupurezulakikiver.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26474acef---45683743435.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/iot5a1grbc6iiusv4gtvadfj4l/99755337324.pdfIn PDF document text
    • http://kesifveotesi.com/files/tebutimuxunumix.pdfIn PDF document text
    • http://guruamardaspublicschool.com/userfiles/files/ronojenikinalovupu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/99539683040.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://tlproduct.com/userfiles/file/72641998969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+streaming+tv+apps+for+androidPDF 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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10836 bytes
SHA-256: af14c3b12d76899908678c13ba57acaf74501516ce871c265263580d761609cd
font_01_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 18376 bytes
SHA-256: 6b58e0382e412320ab2f32a2d77d8ce0d53051a3aaaaa33510ba3b2e4977c981
font_02_sfnt_off000136af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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