Malicious PDF — malware analysis report

Static analysis result for SHA-256 61526b2568182cdd…

MALICIOUS

PDF

62.5 KB Created: 2021-09-04 23:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c8fa734d00c63e68a69871e96ea9cfb SHA-1: 1a57ac0cd8e4d9f13732c340b9ea803a57ba423e SHA-256: 61526b2568182cdded9224b75367271ad64e0998ca624af0a45fc9758837176f
154 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 lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the nature of this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8035

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/58360ccb4c34da7bb25d29846ee8f3ce/62617549907.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dba78cd45---15710247968.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05842d07---21577194825.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/gegis.pdfIn PDF document text
    • http://headrepublic.pl/images/files/58112433602.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/wopepujuf.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/27887019453.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/39550768881.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/57961627663.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/58043c70071a41758c0be004ffe9a373/vinajiw.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/suridodijoted.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/85717234249.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/mokaxidixalus.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/55635629150.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/91881442405.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7a930dcde37b9b8ea2ffc605710094f7/pizulomajediminevi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ff3dd64---28028945033.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/vujilupoxejam.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/92517022880.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/37030105042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=industrial+engineering+and+management+science+pdfPDF 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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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