Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b8de4bcaf1c88b…

MALICIOUS

PDF

118.2 KB Created: 2021-09-07 15:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcaf1d6e1430d99939f980e239fcd0b4 SHA-1: 514a7cdb318ccd84cfcca5d4a0017be140df7704 SHA-256: c7b8de4bcaf1c88b2dde601f0dd42a81e2e3fdb3721bfc5ad794a63a88b6d7da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://toyotarent.kr/FileData/ckfinder/files/20210707_6FCDD6DA9DAAA6C7.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ggsl9a3bucludc2nr4pkt63o3/gigijuvesekanena.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16c83cd0b---65208910281.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/18576632240.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/61136089666.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/babuv.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df406056b---95904385241.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9357dd6c7---72901221195.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7a12ab30---63952816413.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82e93a9b0---13442855993.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa301010c77---45109171367.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1b6894ba13---46403267802.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/39646496632.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/51497775588.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/b12lv8j17h4v2nn2987njcn0i7/xukipijugevowexib.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/28434635423.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/73825373647.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pawowanuzatumakoda.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42986112072.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/logelukutal.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/febufiziniwuximumeget.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/89ec9aa2e20ffed293632542889dca24/diseko.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088157d22920---wodimejumesuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=teenage+dream+glee+sheet+music+pdfPDF 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_off00016518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16518 19884 bytes
SHA-256: 30e9064a36742478ac6648507f54d4a78f1e1ca23d094a2e261ea594a23fb32b
font_01_sfnt_off000199b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B7 11008 bytes
SHA-256: 9a5f91c77c9eabea0ef1bee901eccc340e434921b9c9e016bfe91efb869fbfff
font_02_sfnt_off0001b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.