Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6deaabfd9d5a4b1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ade179c1f4b04dd99e18895a670c6605 SHA-1: 98cb6e24311bea10ae2fa4756c8385efd1c3050e SHA-256: a6deaabfd9d5a4b1ffd20df857c3c9a13359dc371df6461c417d8b694f8182f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content, potentially leveraging JavaScript for redirection.

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 https://harrisitalia.it/uploads/file/bazufanuropotogob.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kikuw.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/90427082839.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4ce3a77a---wuwukabofizogazajasewerod.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161478db2e5ca8---96392291038.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/moweguwixapugixaxatesiv.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef325b08a0---3811105135.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/kanupivu.pdfIn PDF document text
    • http://intertribo.sk/files/5153176524.pdfIn PDF document text
    • https://cet.sk/res/file/xafofixozavemeboza.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/tugavoteduwomudukimiz.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/88555074831.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zugoravuj.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/89722338484.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/6539934931.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasibule.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/80872556143.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dusomofotiwaxakit.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0f3b65cf---gagikalepaxi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3856cdcc75280195b433556aea74c6e0/lifesabugokuf.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/21573188538.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/91357396668.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/lobunamugiwo.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/wijowa.pdfIn PDF document text
    • http://kbchina.de/upload/98097159265.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/moxemexemudag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+latest+phone+2021+price+in+bangladeshPDF 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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 11440 bytes
SHA-256: 78f6c16db6583fcb14554bf50967bea09d231716aea5aba382137db499e3ca65
font_01_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 18060 bytes
SHA-256: fe5bdd95f21748a8c95b66c2b69f46a29c635105f66c3245b178d92a2cfa9f06
font_02_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1