Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c18538ec288dbc4…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 23:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e792d3fdf804deb3d4e5c16657d80214 SHA-1: d667bf5eb5ea0ad95aeabb6e849b7258967254ce SHA-256: 5c18538ec288dbc44f36b2adc117d25cbef39c1a3d2de26057ed15b90ae6a859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of a "download button" heuristic and ClamAV detection as a "Pdf.Phishing.Trojan" further supports a phishing and malware distribution attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0bc3ed6d---delatemakazobolepa.pdf In PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/918f7251be5cbd978693a6ed1b280b78/51443918079.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210518104525.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/32717835436.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/72673864283.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430125149803064.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/22cbf264c74893aab551e813e89fbf11/piratipukuwaz.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0005a876a30e4a763945913e5b2ea2c1/42756427839.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/ralexilop.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2dff89b6ba149786c3d7d5ea159dd8a1/betakus.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/baf0b91a1e960c3a57c9061ed74af12b/kirolonudebazilixirevoz.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/foxonofas.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b8e75a1b3---75268281226.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pevirelame.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/84678996938.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac441225f05---67500763772.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/59acnhl4u5sm743ru7pttg41q4/2775400774.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/rujefupefesedegex.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b620253287---mebegowelosapa.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/49836060578.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/44137855420.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/99202265762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clash+of+lights+new+version+downloadPDF 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_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10816 bytes
SHA-256: 0d776162d2f127e15f535a03aa28956df104c22df5f9848e10231c10443b9cc0
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 17120 bytes
SHA-256: c81380c660de6b15ac5373beaaf04ec918583d05064abccff2d291ea341209e4
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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