Malicious PDF — malware analysis report

Static analysis result for SHA-256 047d648c4056372d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-28 15:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23827997b8480017899c0f27e842a5d0 SHA-1: 3b30664af0abdd902358b8833ffa51c374e02ea6 SHA-256: 047d648c4056372d2bf9a89e2f1e4037c975e66d60841b5b4473703ad5e108ce
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a lure for downloading further payloads. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://kimkhimientrung.com/uploads/image/files/42765631183.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071e514751c6---pitumefe.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/motovezagunezejada.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/vosig.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/34626280123.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16121042282d36---wosevutesun.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8914ea13---92496937465.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jizupewejuxumon.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/66110485204.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e03a5208b---jomukakutogozilixofat.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210822235858.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609635a825752---14759862058.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fakilolu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/giwovoxurezukumi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090aac548031---68132676724.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823dc284215---86376880670.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c908f2a7---farexujudozivu.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/84794227403.pdfIn PDF document text
    • http://mamam.by/upload/File/file/mesabokunur.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/42444957988.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91121633240.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53781768530.pdfIn PDF document text
    • http://sparkpro.lv/content/file/74841877897.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/636cfd5ee707c074897a9e3549d657c4/sawupere.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/4416997214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=eps+to+cdr+converterPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 18760 bytes
SHA-256: f34b5d12cb18d7b9e8176d904efa8f50a7e06dc5b00fee36904fbb6a5453541b
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10256 bytes
SHA-256: 682c082c772405397df604c906a2c911facf6b081add477409ccb8513f4fd87d

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