Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2ce198b5b424c6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 13:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61c8707e6a44fcc90cdb082ba3530f6a SHA-1: 1db8ff9b1cdd1f83683f81302c7c5d0f7c02a225 SHA-256: 9b2ce198b5b424c62eb76794c220c0ad2b1416feb3827347f75b4cb63b41f4b8
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the use of compromised CMS uploads and disposable hosting for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.yt333.com/userfiles/20210708/file/1625694508.pdf In PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/wuwilurefibuxujazuk.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/laxavaxojijikasexok.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/notifipibizig.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fac06f40---banatu.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/328221006.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce03d539943---wedekilonumuzo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vadojutakemelinazuge.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xoxinesilasup.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/62874543655.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/973220762.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/26670336161.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/sdm4hclbkl5utn4bu1mccivsr1/fitikirisotufumevuju.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/616d86e122078739a3092de6023dcafc/71419435145.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607575a06d0c7---69925319121.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/57000f572a4ceeb30b77ab99e1f2130a/dovosonesilam.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pelajoxi.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/lisuwojogeguvodejujo.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/luropadekurate.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c725798c067---63969291214.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jemitafivifusek.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe235d13ad---kenonewidudejurezexi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/gkfn74vvmoi7vv18na0b7916c5/10659835156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nrma+claim+form+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 17712 bytes
SHA-256: d9d9209e965e26ff59d397ae0cb3d8facf09cb165088e00aee637affbef5eb4c
font_01_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 10256 bytes
SHA-256: 67ca0032227914525adb2fed82a36ba81587fa1fba2c8e90a2cd9a6cb545cc46

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