Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fce0dacae8851c0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 05:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a60292e0a0f963c421dc09d6ad599b60 SHA-1: 78cb3f933e0b922c911e45840e19a4e3ca8675ae SHA-256: 0fce0dacae8851c0c21275aa6be430bb8a8d36f3102bc5645d1a3de41bc76d89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and a significant number of embedded URLs, many of which point to potentially compromised websites or link farms. This indicates an attempt to lure the user to malicious content or download further payloads. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6dd5a0f2---fesivinizuxaxisejajokuf.pdf In PDF document text
    • http://fairway.cc/images/blog/file/bebaxosikunavi.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/zitatepefuxe.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6h585cac6hnv39h18mnkojp8bq/3109714672.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/27994473615.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/79974967555.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/48904418643.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/49091168074.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/wofelunekogukew.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f0ca3d4c---temebure.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/7885746701.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/ruboxok.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/zokelipodamajitozux.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/32212957101.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zajopedumulawisizaxot.pdfIn PDF document text
    • https://suruburi.net/mm/file/kubesorugowokog.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/26941539683.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/61475719502.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/57557137763.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/38400675167.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/novobefuferez.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/bitezigudafidaruxuxeroro.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/30022892808.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/47937553039.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd1089b15---66083792910.pdfIn PDF document text
    • http://vning.net/filespath/files/20210904202227.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/penavujikibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wallpaper+not+changing+androidPDF 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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 17084 bytes
SHA-256: 5a436467e2743f792a868be3debda4c3c09787d081e89f41ff520f2a0fd5b739
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 10620 bytes
SHA-256: 819131891a03cdd934f9f39e4e2ff2348239c209f643053d1cedd45f7c8a01d4