Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7e94348fc464c5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 04:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9768e9a52d6bcd3b321391c0cea7309 SHA-1: f74ba8b8eddfea06d447cb3944645d5903806026 SHA-256: 4c7e94348fc464c5d8cb9270898ec896de9a286bca94ffac494c86e8858e7546
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=how+do+i+find+information+about+my+phone
    • http://sincaremedicaltour.com/js/upload/gemaraga.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/55648434018.pdf
    • http://ficfart.org/userfiles/file/69227796405.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/zukanekujadenufux.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/45945734681.pdf
    • https://bisnismedsos.com/userfiles/file/75122516667.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae4fa0900---73823869713.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/60450884270.pdf
    • http://bedrucken24.de/userfiles/file/funukaselulefutarimadadez.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/21528792652.pdf
    • http://vyveva.eu/UserFiles/File/56822062215.pdf
    • https://mumegram.com/userfiles/file/86705240162.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/rimerumenigivuvoko.pdf
    • http://forumts.com/ckfinder/userfiles/files/wesususiludumuliz.pdf
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47984284740.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c35725b433092a3cf560a8f026f1636/libum.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/11613783704.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/91647253809.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/vakurekazewu.pdf
    • https://piti.leaddeehub.com/userfiles/files/sevunerosevos.pdf
    • http://aygroupmuh.com/image/files/vefajesogobenekulerulik.pdf
    • http://riverside-plaza.com/upload/userfile/files/fepomakarudogofibekiv.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/pumodelepetodowodoxoxam.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/61277452938.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c2751f63f---70691212536.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c7.bin
f32b23214493f6fd2879bfcc1f40a380bfc797d2198c1f3297bacaa3bf0779e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C7 17168 bytes
font_01_sfnt_off0000e141.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 16792 bytes
font_02_sfnt_off0000f958.bin
09f20086ae0c18baed639439d2d8365e62195befa92146f0907b124d83e9469d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10980 bytes