Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8071a72eb6f543…

MALICIOUS

PDF

91.2 KB Created: 2021-08-09 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2df8612c73f4d5f0aee1990da802c1da SHA-1: fa4e6acd15b8231ee859ffb16979ad5e96dfe726 SHA-256: 6d8071a72eb6f543b7cfe7b97f1d02e451431166092efe194607582fb3fd9cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://jnvhardoi.org/ckfinder/userfiles/files/1468163479.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761eb1c7bd3---92019050987.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/34858431409.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/fizovaxopimi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/rozug.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e9b3ba903b1ffa3daad78ab69d9c1a87/78236717593.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/14923501695.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/26925273800.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210608_204221.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c6aa0417---gupomavokagusezuvudaza.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b467e12bf4e---kolujemuxebaxo.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/guxajoz.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/85680649951.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072f0feaa752---93892139222.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tozipimefu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfe331c13---99926117419.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxexarevewitusijezudetor.pdfIn PDF document text
    • http://4bx.pl/public/file/davowudozesika.pdfIn PDF document text
    • https://bczenekar.hu/files/file/fesamogojev.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1b496944574727aff361f28acf0215ba/badidevovonebulusinotelu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/jowisinutix.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/sevevemafadugexamutixer.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1600be7c1e1b5c1b438e3ef646aa5cfa/4831557186.pdfIn PDF document text
    • http://partnercable.hu/files/viwodanejipe.pdfIn PDF document text
    • http://coumert.com/images/file/49706794934.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbfce12ef3---dimaxiwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stock+market+basics+in+tamil+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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 17780 bytes
SHA-256: f36a26af705b7378bcc00b4f3bf2a038a5959ccb2c23e421b182dc3717c5391d
font_01_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 11088 bytes
SHA-256: 3e79d5a3f8ac16e0275fa7d4b1c1c499e084cd0ed436af3f09d639ee2ce9c910