Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f8c0a9f9a4681e…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 18:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcc531347c319d68207a5ba5c2e48146 SHA-1: 1b3cc2c322aea7d7260337b9c5bd827df9a53854 SHA-256: 54f8c0a9f9a4681e55ec295f2f271b472153979ca00f56ce31e48627f50d734a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://copab.tn/216mag.svn/uploads/files/semobupoxexunoludokebevu.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/donadasojo.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/lupufojadirizivavezivod.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/reves.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/fufodibetimi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/89987594891.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/labuv.pdfIn PDF document text
    • http://texmet.pl/userimages/file/68779185095.pdfIn PDF document text
    • https://pmms-online.com/assets/file/zupotulumubolosibi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56250bf8e5---85113612543.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210904_E2A99B34C167580E.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608162ff5f521---wilimunoza.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/82623341481.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/72137414305.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/57777378635.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d268e11098a43460318f4fe0e6b3b4d1/32316244348.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/pudozob.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/rixeko.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7010e9ed00---25219255485.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b90da5db11b---zofage.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/edb0f3fb327c82753b33a979b4529236/22186080003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=holmes+whole+house+humidifier+manualPDF 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_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 17476 bytes
SHA-256: 3f8a198e3f4a0e06ff95a7a2ee5a901621009a7aaab3f93d7c91146e82ec02dc
font_01_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 10696 bytes
SHA-256: 06d726e382fb690153758876138e012741fbb12265f1b7db73c869c22663562c
font_02_sfnt_off0001439b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1