Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19fe75338e98fe2…

MALICIOUS

PDF

92.1 KB Created: 2021-08-20 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4d3b83cf7d3d90aade101a4ae8eaf0e SHA-1: 9cd834215e503af074e043664997cbbe475ef0b7 SHA-256: f19fe75338e98fe2c1405ee1d209e62bdcc3cc4d06267e1408f93fc1b0ac88e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which host further PDF files. This structure is characteristic of phishing campaigns or malware distribution, aiming to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f8c34158300c8d94d1d5b7bab22805d5/zefizumezomelaxuxuwulo.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d89f79864---18111744588.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/matojaludip.pdfIn PDF document text
    • https://ms02bet.net/contents//files/vijodalumolu.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/94413792177.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/25108394435.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/fegurubep.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7b95e8f6f3a55911d42b142ed24621a3/sikidoxosebigodino.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fae90f292ca---46483353909.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d21228be---31226837131.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/fezareratad.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/4812215513.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/eki8u9h345sqa073gnupjcfc76/36729657311.pdfIn PDF document text
    • https://kede.org/userfiles/file/fenako.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/jekodogigewonezedubeba.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210603_513AA78E21DF1500.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/juretepa.pdfIn PDF document text
    • https://ka-base.no/images_content/file/93111318059.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a3b2f48adbc947929aed1290e19151ab/wuzivozuv.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae978a1160b---wojixumunaxerij.pdfIn PDF document text
    • https://inncredel.com/uploads/22824823085.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/870fa6b8ba380f8408edc678d4a03bd4/lutaxuganefutexizuse.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/792070fd1fdced77bfbb5ebf7546cb94/wufudinokubaza.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/mozivadamuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=price+of+suisse+gold+barPDF 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_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10692 bytes
SHA-256: 7cf133987370c606dcdaec46784b7c03f1f44ec0f7dcee90a8d9d516b03c1b7a
font_01_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 17288 bytes
SHA-256: 65a3258e156ccf8fd35d3ffee2a46af13b9b28e2d5a13d5c738e43913043b98f
font_02_sfnt_off00014b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1