Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ec3b0f19b9c6a8…

MALICIOUS

PDF

74.1 KB Created: 2021-06-27 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f33a94cf79ce20bde09a93d658f9af2 SHA-1: c5e23e484b2946b88b953e7f71ad3b0c8be1a207 SHA-256: e1ec3b0f19b9c6a8f2772dafcea8e945b7f457c944a04e87b86535e9e5f1c7bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/im460na8ji49thtf71c00jch5q/xiwujukagijar.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5d0qei6jsde8clodamubb7cafr/73513679388.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/tapukivojajopigilis.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/15f291da022d1c0e60b4b67abf359e3b/79629460397.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/baviludexawa.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/mabutubuze.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c415db244aef264d8b2549e17e8588a/20242373758.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d323dffc---lijolezexokilepi.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/tibazosupusowiririvubupa.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052106222573499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23d526766d---vosobogi.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/katenomow.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zazivipirileja.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/numafatokapajukarutorumuj.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mejamoz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41b80d775---65659717748.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6014241a064f11e236e1cb73f766d5b/83293202335.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/40928454369.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/gu028ul8mmff0rlq1fniacbspu/90421958838.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85da7f897---65689997493.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9a93088---tazupareladuvulebowezani.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050203340420.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/c1ac6fa2a75445d218e405bd5ae91261/gotajeneriguforovefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=silly+things+kids+sayPDF 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_off0000c09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16712 bytes
SHA-256: e4ba27f14b21acb6baa135ec8563595e204938f77446c87a5bd7209578be228c
font_02_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 10456 bytes
SHA-256: 6d9c5bc001c6df87fc48287aba1448fd0fc63a34fbf672580db09fe64e116c49

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