Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c001dbe8e26237…

MALICIOUS

PDF

115.0 KB Created: 2021-07-09 20:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f0d3181539fcdac5563b230d64a0c72 SHA-1: c4b0c70e47a28c87b9205670d6bc3a91675da37a SHA-256: a4c001dbe8e26237c65523e0120178c0d41836eb14093b7f4cc283b1cf17da54
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://1877painters.com/FCKeditor/file/pelene.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/09364e68bf413df31dfbd3f1072ce9b1/49648368810.pdf
    • http://ziconiavip.com/uploadfck/file/zatejakof.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0h6045kjo67s8dql15hdvpdal5/20576000312.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ic0arfae2qvksgh7gitdpdg0q3/61257590382.pdf
    • http://apexnepaltravel.com/userfiles/file/30485020786.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0b3f28b00fd07faad836c12816db99f3/bibelokilubuvekosifexuz.pdf
    • http://www.gesas.it/media/mailinglist/file/18958517536.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4deb79d10---jagofosixufiruwimawikap.pdf
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/24085367373.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2efb1c16223de61a647fb0477bcb4d76/59281353133.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/57d3e8416ad1492241daaa67b91844cd/ragopu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cc62bd5f332be5e258c17e2914d359ef/vakamirebef.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5cd8b8f5af774c1e1d2a25d5e05c224e/82806196369.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a9f27805---56928990184.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/podoluvorofarelivax.pdf
    • http://crosswaysrecruitment.com/userfiles/file/81808172003.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16086844cbe244---97449047578.pdf
    • http://ankamet.com/userfiles/file/60580217116.pdf
    • http://ilyxrace.com/userfiles/files/70149961495.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210624_6AC70B68E78F92DC.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba16a7cd4f---jazuxali.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dc79e651---dinixus.pdf
    • https://mmagame.com/userfiles/file/jojuloderavawileboxepiges.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/91eb6e5383d5ded2d0ad4b0431dd9c69/84639204712.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=anchovy+sauce+sputum
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016044.bin
8a245db14848e264c68df56a3de1b6ae109f927e5c238b4c6ad05ad1128b4b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 17496 bytes
font_01_sfnt_off00018e65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E65 16792 bytes
font_02_sfnt_off0001a67c.bin
b02385459315af0c64a8b7614a7e49b625fc15942d03b483035a3491cd232218
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A67C 10664 bytes