Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ac24724669dc51…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 06:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b88816bfae25eef93e1a72e81ec083f5 SHA-1: 5cbcb99e604002622db18ff2826736c80c9bb938 SHA-256: 77ac24724669dc51f28216ae0a7cb7c1bd4a5f4a8d1dadb6b8de9c743ba06ee8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt, likely by luring users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nipanoxifepexew.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dd5179848---80830882399.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/46494547176.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gq1vt4qrilq5thpmg1mgd55b69/wosikedit.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/25507493917.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pozebolitojeketamival.pdfIn PDF document text
    • http://citty.org/images/uploads/file/28212717617.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911105337_z0hr7i.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/53585237205.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/61567905179.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/238d1f6cfa7c66877dbfdfcc9f49330b/dajopudimivuwoxakoz.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/marunab.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/c7imuksl0q233i1p9etci7rimk/60710201658.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c515fc336e---45337273082.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/70726180395.pdfIn PDF document text
    • http://lulanjina.net/upload/files/dubaludojozisov.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5bee8870---xiburopifeg.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/36540908299.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/10918283373.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/91785461269.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/butotezem.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/12288158735.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/jewebenaroli.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/35736636152.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/lixuxifefosakonuxemin.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/13459707376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=windows+7+professional+loader+64+bit+downloadPDF 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 18540 bytes
SHA-256: ed4580f35f1f74a8c83da88bc2e432266f52854080e1065062f054a77d93d2f0
font_02_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 11008 bytes
SHA-256: d704c1bc74da545cf7add6a8e2fd25010c5c10affbd7d1165c174614a6da0833