Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db5f43a1a61ea5c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 18:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fea0752e3f3273865dcf69eea55b6f4 SHA-1: 5a5e588b08df4d872b674f428944830dab05cf72 SHA-256: 9db5f43a1a61ea5c98460f289dcfd17194fd95429ad45092c1ea94364d5c657e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lure users to malicious content. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://satuldelut.ro/ckfinder/userfiles/files/zejinukawid.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dcc52d3c8d231edfaec0f898d5b76f06/6316190281.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/55874913797.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5984fc78---zupizibakufolujaxenopu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16076af1f67960---jajajunukeju.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3i1al2ilgvgk59qu2nds6sth24/pububitapituxanujazev.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/m0udsk0tkud8o2boe6of2me4eu/13181087066.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zulivobu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/dulosuvanodu.pdfIn PDF document text
    • https://avela.md/userfiles/file/bavemujajuminukixixetime.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087db61e2d89---1325209035.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb4dd46a052d6ddffd7baa472edf7f1e/nowanositiren.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/vusijavivobopagekuzulaj.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a1gsam4m4khcp10q3u2ik4cbj7/28223566960.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/jezuxifipoxowukorekugoba.pdfIn PDF document text
    • http://newworldss.com/uploads/file/87776517891.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/89648136870.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/82046401833.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f5d026c8---nujidifumipujosetel.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4b72ac99---zebolobodevom.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jdsm1jn20sda8as5js9k1ic1gj/riverujisubud.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/18912540100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+ppm+chlorine+in+swimming+pool+waterPDF 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_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 10900 bytes
SHA-256: 7584cc46247f5bfb000f902e5c36437aa484c2d8c0dbcaad68a0d9b8576e7706
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 16576 bytes
SHA-256: 61de1e2bb95f3144217e9f4f1023fd07c96488f94fe057435bba81166cd86fa1
font_02_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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