Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ee568809fd9062…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 21:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6d2f45dfc6a11ae7950ac9efbf3cda1 SHA-1: c614012051a5e375cfb2df0562fd7750cf6c515b SHA-256: 99ee568809fd90629d1523b76473633313d596fe752b4b7d9d54208369b219d6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The presence of numerous external URIs and the detection as a 'Pdf.Phishing.Trojan' strongly support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sausalito.com/wysiwygfiles/file/povebebujakejarone.pdf In PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/1646146452.pdfIn PDF document text
    • http://platcometals.com/images/file/suguxexiwuxaguz.pdfIn PDF document text
    • http://www.pilartangguh.com/file/54654149577.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/88258692698.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/duwakigofajowezidevono.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/82619461113.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/44699544472.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/razademuvex.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/dakezamitot.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec8d8170e---sepukivag.pdfIn PDF document text
    • https://suksesunited.com/contents/files/26614247052.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/72416988525.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/vekazexeximatulufusas.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/53df782701a0d022504d020a3a86e2aa/jezede.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/69643991719.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/32929170453.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26308101602.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/49785292688.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210913045918.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef4a3270e---xijuxu.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_014955.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/37240757607.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/buminunub.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/79328262402.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d83aaa60fe714d64becd6ba4aa6afd41/mamoxupesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=last+shelter+survival+mod+apk+unlimited+moneyPDF 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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 16892 bytes
SHA-256: e18eb5716c3188076410558279e0239aff3c2b6bed3e9b5acb58e2d1521cc1a8
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 10988 bytes
SHA-256: 2866769cfc25e5614a37cb677beb5daf20febfe2de94b4d567791c5b553e1561