Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf65aa6eea4dd4…

MALICIOUS

PDF

91.9 KB Created: 2021-07-18 12:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2a7f5532ef81c3c8b765acea7f0a8ac SHA-1: 89afedb983411f66f28bd4d596e4d8c5b7941b7c SHA-256: 0bbf65aa6eea4dd4ecd8dcd6aafdd0e3c65896dcd4790910dc51b879dddf734a
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hw-power.com/uploads/ckfiles/files/60e4fc6cc86a4.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/v71jtr96o5tg9nj0aco85lrrp6/53845086298.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/basuligegeb.pdfIn PDF document text
    • http://apvn.info/userfiles/file/puxotomixigugijiw.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/palujis.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/11300593749.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/56135321950.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f07fb509e---78987511862.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f50ca0750f3f8a494131e5afcb566e5/jupuxilolabidagonezor.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6si3q7knbpeb0hf21gcg422tl2/70722346909.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/tezusurafewokavu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/6904011668.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/24843da37564fcf43acbac1d6fd0fd9f/lamurufeze.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/tenexejegavasusenutiwu.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/keziwasalenosisosasane.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca61e9976c---53427167642.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ij5focmqv9ca58brml75e3jd4m/sibovewanifazutipet.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b0b50418d7e188100958c14f5d8afacd/99483718955.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b2cf7ee5a041e40271c3331fe4eef4b7/79499658211.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/4643411619.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/ketufukuxudefos.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/99597302890.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ec888f3dd75a61c7a3a7f8ca80a21d03/rebeninil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+codes+for+hunter+call+of+the+wild+ps4PDF 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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 11012 bytes
SHA-256: f269aa363295a7af783e292025d07d42ea2a5d154a8afa81dd2e89bc18b8e68e
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 18996 bytes
SHA-256: 9e7cdac7b60120f9e2e6da457ad64c606dc7b63d7df42972033210043657c520
font_02_sfnt_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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