Malicious PDF — malware analysis report

Static analysis result for SHA-256 109d194ad4cb6f14…

MALICIOUS

PDF

71.8 KB Created: 2021-09-17 07:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 545e463aee00221d89f5e4607781b0c6 SHA-1: 5b3c99907e1b625ddb0d2593da279dae9af1660a SHA-256: 109d194ad4cb6f14669a6ff6899020fb59333d05894788bea129cbbc4b6a933f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised CMS upload storage or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=kinemaster+video+editor+download+for+pc PDF link annotation
    • http://njuhome.pl/ckfinder/userfiles/files/24282496630.pdfIn PDF document text
    • http://momsystem.ru/public/file/zukofim.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5fc40b6ab58865719a35572b4b9c5ecd/gipubed.pdfIn PDF document text
    • http://sartor.ru/upload/files/pokimo.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/23387089829.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161408874b2bdd---67784297959.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/99999959175.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/doravatewekoterenujanolol.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/58518241856.pdfIn PDF document text
    • http://synphabase.ch/upload/file/fegamojiposi.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/47677071345.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vatewejomirinoxod.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/553bd63cf7bf01545c4ac49ab5435167/nejujo.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/ponug.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/12353094980.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/majavameroxoledugis.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vumuzidodepez.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/78596570235.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/lukemovasu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f1dc0035---75402552786.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/virutogusatumukalufegig.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/waxopaledajakazepobipe.pdfIn PDF document text
    • http://mqskin.com/luutru/files/29650497469.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/susubemebuleludozamuzo.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/piwogubidemojapewukuteli.pdfIn PDF document text
    • 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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10924 bytes
SHA-256: c6d12ce431302f69eeea12048cf54d6df1e15a2198267687478b8ef4acff9691
font_01_sfnt_off0000cfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 16356 bytes
SHA-256: 99915ac6081c9258b169b6f38c29a77bc2ee42b680367d8d916e012f34141078

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