Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603ccde05924b8c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 14:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cfb317cb244823e483d65eb8cc51391 SHA-1: ecfafabd151f7bcd92b30acd2044d0ecc6e72f0f SHA-256: b603ccde05924b8cd45d52d5ac15f2fd5a3e9874a79f6633ab2ece15ba4a2e57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute code within the document, potentially to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • 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://durimawar.com/contents/files/gatabobakusadab.pdf In PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/57421286166.pdfIn PDF document text
    • http://legouic-peinture.fr/userfiles/file/kejipavaxijekexa.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rezosikugu.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/xuzavogetabumalu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qelpj6hjfa44orlm0s6a113vol/bupilakuturokujerurezaweg.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rafujibirobolaz.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/35797576686.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614958a86d772---nozixisa.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/27026575840.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37304471646.pdfIn PDF document text
    • https://domilot.com/uploader/files/70377597436.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145e9fb9dd9c---kokagaxibabegibolo.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/linovebejamitalosos.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/85560663580.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614366e6c4283---nimofodezogoduvidifi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/lebidagodonanelemuze.pdfIn PDF document text
    • http://shopabrang.com/images/files/belebitunubavote.pdfIn PDF document text
    • http://imaginove.eu/data/Files/zarilobiwuku.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/nifatipewugogirivudimodem.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/24186138690.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a136f09f0d45aa2e936e9e5b19490e79/80249663384.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/20440124545.pdfIn PDF document text
    • http://www.depomatrial.com/file/41451538904.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444e947f1ae---61895794923.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/36619747207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pool+clash+mod+apkPDF 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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 10344 bytes
SHA-256: bc1e03b928066b92802365ea81b8815ad7a019c64ee8a7d10aa090212465a56a
font_01_sfnt_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 18752 bytes
SHA-256: cbf0e14c5b2b327975d38710a0c1439ce837a1ce51ff0ba72f5ed9a9a8a0f2f9
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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