Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ec15e5c08d0107…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 23:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89a2ec1c58ec21e96e611f1bc5e2934d SHA-1: 788cc18826d24dbfaf633f5f8280eebb4453c6b3 SHA-256: d3ec15e5c08d010724d336052cde42aafcdd76c259205a1e23dc95c5db37b06b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is detected as a malicious PDF by ClamAV and an ML classifier, indicating it's designed to exploit vulnerabilities or deliver malware. The presence of numerous links, some pointing to compromised CMS uploads and disposable hosting, suggests a link farm intended to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://jbdclothiers.net/emailer/userfiles/file/tanadatin.pdf In PDF document text
    • http://cnpair.com/userfiles/file/sawejazexu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/91523419368.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0ed6dc19---juremerifanewasufe.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ninavepomokukeruponumanin.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f203d4706---58624196279.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/19186743934.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/suputujexujeludi.pdfIn PDF document text
    • http://sial.pl/galeria/file/17478975367.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/39819375704.pdfIn PDF document text
    • http://kmsenior.org/file/files/74616978381.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/85183219310.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/63070718134.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/28361291400.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6it9eujephqjcla30ncr0l5il7/48489524024.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/30644027906.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/libunonetuxaverijug.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161358b9f70111---56564276807.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/96646481551.pdfIn PDF document text
    • http://otczenacts.com/media/files/dirazububejidesujofinone.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/30251966552.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c116eb0e---zigugufabukabexe.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/norisulunepepixunez.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/73729183587.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/59221088120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ultimate+soccer+mod+apkPDF 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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 20848 bytes
SHA-256: 28eda5882fc571c925f6f015d0885ecd1ae7a65f39ce6ac47055241a77b86b9b
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 10672 bytes
SHA-256: e522cd2ef0e3a9f39f22f67adb3afff7bc60342bd2cae2c6371776a566e2441c