Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb27cfef802a19e9…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 00:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 262cfd5fc9250160f24f331fddfd742e SHA-1: 7dde1e8fd12fe00a3333e4c5ff1190626536c23f SHA-256: bb27cfef802a19e9eff146247ca9eb1400db868d27a901269e453ec72954bfc5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that redirects the user to a series of URLs. These URLs are hosted on compromised WordPress sites and disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves leveraging JavaScript to initiate a redirect to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://htk2.altrodesign.eu/ckfinder/userfiles/files/32804006727.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/68764578480.pdfIn PDF document text
    • http://gibisch.info/files/files/nefubuxubozekuxa.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/70357422473.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/gajolaxero.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/midumufapabefidebal.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de9e7e0f42---23706421485.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/aae0f9a54a19e92685ec7d7568a814ac/ruxazejukov.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/9201589984.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109181754421336.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/buwararad.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/magolomoweda.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134008519c6f---fonofevopubis.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nabojunifozawiwojafa.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/77338771243.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wijumaba.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/rutuv.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/79610313299.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/65013512534.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/vijefasiwipoleza.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/turugexolufibejefe.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/30117135707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+stages+of+pregnancyPDF 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_off0000af33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 10700 bytes
SHA-256: fba5bd964d02fbd852bd045557515bdf934a268e728335745d77c83af7994b5b
font_02_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 16004 bytes
SHA-256: 2644a904706c449306eda3cd0081847f228254ca98a651530531e5fd7e70e607

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