Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada70038fbbff547…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 19:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a798e812501bcd5afba5e91ab664629d SHA-1: e2ff4a1304553a3668551e258ac27b09cf6422f2 SHA-256: ada70038fbbff547453105eba3bc386671c8f2f2ed7bd519e104fc2814c596f9
216 Risk Score

Malware Insights

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

The file is a PDF that uses a 'recovery secret / private key request' lure, indicating it's designed to trick users into revealing sensitive information. It also contains numerous links to compromised websites and disposable hosting, suggesting a phishing or credential harvesting campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/mutotozofotunifuduwegi.pdf In PDF document text
    • https://abofahed.com/userfiles/file/19586213666.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/puguna.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/nalinexurezatifoxejome.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/41745215691.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31301044129.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bc76fd5e7f0---71083789432.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/602ec9256b8cc6f5cda61412547bcf02/10146294444.pdfIn PDF document text
    • https://ferropula.hr/files/seloxokib.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/nazumabamivumubejemos.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2366e7fec---48451509379.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/tivabogewamikipufak.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/bofowoxewuvafekudufax.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd8f8cbac0---17454559450.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852f797961b---botamadetabadikaminavep.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/39903883942.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce514a969e---pezasabalofigewamumoz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fegowaremowulakovatozekos.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd52b8d53f5---dagesatoxot.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ef3c4df5---84000361413.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160922044b56d1---luxezap.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/95488834225.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a82efp2u7b204lj3ar43892v75/xalesavexivolabevonus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+adobe+pdf+reader+offline+installerPDF 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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 17100 bytes
SHA-256: a07bb2a9200ceda0221c8b221e50669d2b72ea4fa5296d9c93e417f87c31bc2d
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10716 bytes
SHA-256: b3bddff8a40943e6ac9d7227e3f80790c32daaaf274b6dc6d452fe7a73329315
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1