Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33ee4a323a25e37…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 02:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7daebe41f07ef58d0329f5b8ed5b348 SHA-1: 4b1f561a4315b2b0f1726cb76b6b849050107e56 SHA-256: a33ee4a323a25e37a89747318242a64df8a10cfac251d7b63ee0ac615596fd0f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or hosts malicious content. The document functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=director+of+nursing+interview+questions+and+answers PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607733e42e8a0---11781428269.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/592a9e3924dd940fc7bacda46caed2bb/fetumu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088345741545---66896955196.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a7b42bf8---walat.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/semigakeditolofok.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a43323207a---fagatamigesabuxi.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/doxetiputimasuwiti.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/30278497347.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/82163111117.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160768ceeb8665---2173328913.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/36786296327.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/88963492488.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/jevoxu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0283dfe79---zofirikas.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd4d2c7a70---43184919110.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210610_3B73BAF14082AE22.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/dg0n4hj2b4d7bertvab3l36h33/45523301959.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d74962b02---21382313178.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3lqn04bu6fc76r6f2sucitopvb/serulukevuwoxufuwexon.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088733f4c1a5---63531423579.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/62050f2bfc535ce864b48a97c570acad/21180094306.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086be6e552e6---lesesumopobogijekuluwopud.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7947e5df48d7f702f0e3d37caa16b19c/ninedatizarotebeko.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16744 bytes
SHA-256: 3204e35385f769f72c37c0dc7c1a11ed8eb435db418c7b54d748dd595dc88477
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 11004 bytes
SHA-256: 83ba9e8300418fbc1945399d4c8bedca7bb14a0e56eade674f60dfcf27f46d3b
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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