Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27671892f3056c9…

MALICIOUS

PDF

103.3 KB Created: 2021-07-19 03:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7850515b20c3df1ec7f7bb86e13320a SHA-1: 378b10b34644f74878ff119f5a583b7474bd7a3f SHA-256: b27671892f3056c999d576df7e30fb2385df176069d51ee1ebb2df9ab9d2438f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cb0e3f0aa400c691484505fb904b5351/32967718477.pdf In PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/lewaforasegesax.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/42f38e962a147447e60cdfd080601701/7320034234.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/jazixuxuzibonodem.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/lqq9au3dri5bf5fpr1v6d0rlf5/mudebuvagoxufekuxop.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/fopagone.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458a8d8480---15048997682.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f0a3e470---72252757516.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/18811359073.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab819d1cf60---sajudefubabovoxigirevud.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/19393773744.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/gibaravarupopadotafuzizik.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/cb531600e0a95520ce169bf025b0697e/pujabul.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74e6586a3---wetilezafejewototemun.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/15938120154.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744742b9a38---39983242392.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c263a91a149bfd850f1837c6bb7628d0/57930039036.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/87988852252.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3049412---sakigajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2265dc98f7---mivekifexilewav.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ea0ff404eadbb6e3487edf18d19a6a97/babesavosuvetupizelu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087101580ec0---tasagadibewalodabavagamo.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/14654935470.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783a99169f7---lugotutajapewenezidad.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/bimuvogorowilal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ano+ang+solventPDF 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_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10140 bytes
SHA-256: a978a0ebfdd6f68ab63a632d1b811d4708bdb794bc882e65d6c708e3729a3892
font_01_sfnt_off00014613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14613 18884 bytes
SHA-256: e9ba7c31299e653c256cd6ed359a94442fc315a16a43f3e3349af0386dd454ee
font_02_sfnt_off000177fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1