Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c371b3b9d1ed372…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 02:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dc5a4f2ca41f622841fc5cd294a3e41 SHA-1: b18c506113899e27ebfea435d2990e90ede33c38 SHA-256: 8c371b3b9d1ed372ac205d21cbac4377c95072fbc031ff6161e36e7506646fc3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which could lead to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://smartdeal.pl/files/upload/files/fuzuvugewopivage.pdf In PDF document text
    • https://ms2gacor.com/contents/files/38976170784.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/duwogufuwuwotemenep.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/39222114220.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b540ec8000---jakuvatidi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/dutesojofizumuvi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131758eaac09---jajepeporulawizol.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/rcoc0e8rjg61d2t3pslkl5o303/zunasizux.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/muwebe.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/46886338819.pdfIn PDF document text
    • http://pjteam.hu/uploads/netewogagu.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/1061566215.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d35b040c8eaf7cd114af38630eca9ad0/85311474012.pdfIn PDF document text
    • http://teifsepahan.com/files/file/puvabadatiweletazew.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/77121578070.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/salanal.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/pimepiguxofijovubutolu.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/leserawupogiledufenawo.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/kevivonixinogubudaligajid.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/juzufurutodozaxan.pdfIn PDF document text
    • https://podimercrm.com/img/files/79473439463.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • https://masukpt1.com/contents/files/20881903277.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26864730127.pdfIn PDF document text
    • https://laps.pl/userfiles/file/beban.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210909182507808846jw325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+send+messages+from+old+phone+to+newPDF 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_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 18444 bytes
SHA-256: 54678d69837beaa8147971d53a4a71bf399cd4b56e0045de674e3cbd915d31c1
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 10932 bytes
SHA-256: c632c3211205e9a9c05a3c93bb22ed6316095e9cdf71d40f7ebd02580fe5f8b6

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