Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47cbce5fde0fa1f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 02:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 119c32d339c0fc01b52940947699fe3a SHA-1: e70ce8827761f5aa76ecaa31ca125f5d87d81464 SHA-256: b47cbce5fde0fa1f609c5215ef89ecc5f55744a0502c58899ea80f4e6502dc90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV. It functions as a phishing lure, indicated by the 'PDF_IMAGE_LURE' heuristic, suggesting a screenshot is used to hide clickable links. The document contains a link farm pointing to compromised CMS upload storage, likely to host further malicious content or redirect users. No scripts were extracted, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://studiomanzella.com/userfiles/files/zowixokigijujuzaroruxaba.pdf In PDF document text
    • http://tonyprins.nl/images/uploads/file/jamezo.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/85978228320.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910085504716.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/76248303786.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/jofosupufenake.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/37522550132.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/17bb5d4dd01d9fe798aa82bc3b95e9bb/78731723682.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/40360912553.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdf861c40---zitekuzawir.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091402023573499.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/luzotesoxukazebajoxedipi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/40345566435.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/jabipanexulenovevulanopij.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/jusameburefufiwuraga.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd43480eb---zapedatojibujezoragevima.pdfIn PDF document text
    • https://keongracun.org/contents/files/88422442316.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/gufefose.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/85619896323.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/67129019305.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131821caf00f---takanug.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/63883472579.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ca8f387a---tovesubitajewuzetovofobe.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/8263876448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+composter+do+in+minecraftPDF 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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 13924 bytes
SHA-256: 7d1563fca35264783d4017c2c77f74b4bfa52441f18e940f239fc2668e83977d
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 10832 bytes
SHA-256: dc7e154a18815b0e7047aa80f1cf28caa7fa3cc5c5496792924108264f68857f
font_02_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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