Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce4407e9b251f53…

MALICIOUS

PDF

72.5 KB Created: 2021-07-24 03:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 7415cdbdb5857be399c1ed4253404209 SHA-1: 7611deb2fd2513af35e1c45b49a60efba5a31a33 SHA-256: 4ce4407e9b251f53900c3a18566c9477a6f8546d19bd88aa2a21c7b62c7cd24b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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://floridainvestment.cz/files/file/kesimefofevinezekika.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/aad7ed80a5848da98d8f3b98040c8770/16833286416.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/zeteravag.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/80045819037.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e347d9ffa693a49b0bd62159c2383b49/vanakijugirupidoju.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160742f4346915---52216369338.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9c2bf247292af7e1ff5869a7736c62d7/rikinile.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p58jeji4rkdth953huhj8798d1/67270548765.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/58259204008.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f56c3605598---61911834508.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eabcb897e---wetulemumixere.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fd85a9337bfefa246448c628b514deb6/81687444290.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2758ad7bc0---bosurifewididupoma.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600e02d9ce---fawukaraxajumel.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0fcc74a9---xijev.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/muradedezabe.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42367c439---5974877939.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f3757af2---diwawifunuk.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/86491882040.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cjt49dt559shl7110ltmrr5n5l/novuzuxufokonazilag.pdfIn PDF document text
    • http://clarasonic.com/upload/file/77203828979.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/jitorijugusegapapug.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b8d908c9f0777433ae2227f06b18cede/likimudolematazopit.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+pasar+de+pulgadas+a+milimetros+formulaPDF link annotation
    • 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 18080 bytes
SHA-256: b2424be1f9fd7533e9bf3533ecf128c9b374161049226b41bd1ca38304d48203