Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b17451d76b0b9cd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 23:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 064f4794c7c43495e31f15a294cdb63b SHA-1: 180bdc659be0de39c50724f6fdc061c810e46492 SHA-256: 3b17451d76b0b9cd96c5468375649e448f65662a6da6f73665a9bd9cd8cf1181
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate a malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://motecx.com/images/file/9003155238.pdf In PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/73218994450.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5020381b4---52238725293.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5a1640ad0526c4c4887a49281d2398cd/zetimizin.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/15717498812.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/20352369396.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/30712561369.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48c8e7855---jikinawewurifubozef.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/64435763212.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/nanijabopesidelovoguf.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/74335201951.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/mifima.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130caa0e6eea---vumawexixi.pdfIn PDF document text
    • http://zamgph.com/uploads/file/050728162894.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136832a68942---71027290075.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/14702207346.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/zikolokutojuse.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/33510645205.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/80241036426.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/8494615407.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/89988403007.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/basikom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dream+league+hacked+filePDF 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 18036 bytes
SHA-256: 26ca7ce9f19fe153be0d8a23dc6b6e74a72c4711f98e506c2d375adf59a5d163
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 10628 bytes
SHA-256: e031bc34b433622e476369a4dcb3c61b83314089635f24d5aeab1076ad1f22a6

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