Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4ef3ea29c20f15…

MALICIOUS

PDF

107.5 KB Created: 2021-07-14 07:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3bc4ed3751ddfcfaa4251c520a92814e SHA-1: ad3e723a1a79c7e828e6619bb380609358e29dfd SHA-256: 7e4ef3ea29c20f150a16b79e883940055c9f43e43c7304a92c7af0b093926454
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://beiwendq.com/userfiles/file/neviwalubiriwamujiwunula.pdf In PDF document text
    • https://psychologgia.pl/Upload/file/gukejokezopavotovifatako.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c1f163a0---82611767158.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160863197c95e5---4009226994.pdfIn PDF document text
    • https://777mto.org/contents//files/tijidanop.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/99227565022.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6salf5hl69t191eg1pm8lceeqb/kidepowetobap.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/xagaxazinafexanora.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/wowasufosulapewa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f5344bf5---66743491330.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/71625928500.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/956ec7017111dbe0d9df1ba9bcff7db0/vaxudejadazixupox.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/48889901194.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/98726089044.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lenuwepuli.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565ba4a43---dujugamopoxapomewe.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pevisupolajavat.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/biboditije.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedd68004---48272925657.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/larojojefatu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093948714012---nozujitagomepujaf.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57318aa1df---39836058774.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a59c5ff333f3683ec518c221e13d220d/98085134487.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/83c158b304da703c5d1858d328a2af58/bofosisazajomupabuzojari.pdfIn PDF document text
    • http://lucann.com/Upload/file/mapusidaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exploring+translation+theories+anthony+pym+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017ff2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17FF2 19160 bytes
SHA-256: 8987b000306a5fe14ecd510fcc7bd961a0a7382c80a661c57a10e38746b19d5a
font_00_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 5252 bytes
SHA-256: eb0434174a4c484c11137817938748eada839375081002df3250b53d0831f163
font_02_sfnt_off000134f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 20056 bytes
SHA-256: 47d420b993039e996b2dbadc136e8ee834f2dbb62e947e403312f71db2c1c148
font_03_sfnt_off00016648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16648 11144 bytes
SHA-256: 8e8a9b7e82331544c709063aa11e3561ca31838668835b29727467cda4dad236