Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b578f1d06a1cda9…

MALICIOUS

PDF

63.7 KB Created: 2021-09-01 09:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5abdc03c8f0ba9f6126f6c689b37457e SHA-1: eaa272d4cebb688154094a18e26b2cf79a43e45c SHA-256: 4b578f1d06a1cda9bf6fb7eb6e316ec9def599ca9ecafb195ec599b99a20bf73
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+validate+signatures+in+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec9c1b003---51983093553.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/dejuginetuked.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/odkb7ftqpvbjel75opetndglq2/29953783376.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/rimomijenugokozelexaza.pdfIn PDF document text
    • https://purefeeling8.com/data/file/86227951636.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64cc992de---wovusibigesetufujaza.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/465353286114c370e825e.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be70a291021---87575416137.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/xuwuto.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/12264066011.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/wuwujoferufixivumuxep.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3fb5b0d0d---xuwir.pdfIn PDF document text
    • https://dacola.com/upload/files/1648607584.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/53821242710.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/tiwixafunoxisil.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/21894846691.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ac0deb2f3d9cc792ac956fffdccfefe/83456498489.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/tozimomobosatowunus.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/51466629252.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/ba242b5a1fe7f7b9d65474597ece9faf/9463112228.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c6de59b60---98295141943.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/80996486002.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf89817777---migebonan.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kotavobanizevo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 10916 bytes
SHA-256: 213195b90172bc290fdc4c8fdb62cd17a16ea508930a4266a08bd65bc139da6f

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