Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd4ea2df7856318…

MALICIOUS

PDF

86.9 KB Created: 2021-08-07 19:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39b26a5492c84bdc87dad61748d41538 SHA-1: 7abaaacf9584d98cb1885ea14cc03e4f0ac3a01f SHA-256: 4cd4ea2df7856318a9c185d665d8cc6b5320ab0fc8c6aa57e8050c146e3d1c12
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. 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://pistant.ru/uplcv?utm_term=bible+verse+coloring+pages+easy PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b15d68bd8300c2d99d0eb9cf7922db5a/58370767604.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/74956403910.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/safigur.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/lulidutoworikunudixomo.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/23383034408.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/66056435946.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/43868599139.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da66d6f5b---zugodudepufoxufumiduwenij.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a5e3c05d9a---24975420304.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/42893226144.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/tomofidopazowojafi.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/29535128439.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082017e150f2---65267422360.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071434291872.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075922d42c44---39088628852.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf6ca6830---67503388271.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/kajagawugolufevoniraxutob.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/kufixebogagikuzuv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c39506654---18109709692.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fdvoau8p011s7res4ej5bg4rrt/11695375035.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a394acfab4---79827021610.pdfIn PDF document text
    • 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 17144 bytes
SHA-256: 0fd7bdd21b1b8745915deb642c79eb4ff6fb0dca3022ea58915a22109776ac5b
font_01_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 10824 bytes
SHA-256: 76291eedc7203f32d00520f23a8fc81ea4bd7ba149dbcf0765d01291ca91bde8
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1