Malicious PDF — malware analysis report

Static analysis result for SHA-256 565adbded2070107…

MALICIOUS

PDF

71.0 KB Created: 2021-10-09 13:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 96a703de72f491776fc6640d079c8c15 SHA-1: 9bcfefae11955924d24f2094667d61bd36e76fe0 SHA-256: 565adbded2070107f8e07a7c8b77afaa907955ed7696b633a5b422b6b4cb6892
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://pixomot.ru/uplcv?utm_term=quantity+surveying+and+estimation PDF link annotation
    • http://geometracosentino.com/userfiles/files/silobarusiwunagubux.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/dasebaz.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/tutenipu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615e46f687531---92521383754.pdfIn PDF document text
    • http://petrduchek.com/files/xetonagalevelirozovuge.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/xazitudodu.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/31045177389.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/patimuneruzajuva.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/94172984043.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/49657038894.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/22b682cf90f84d0b98626638f1ebd2cf/51113553657.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/34535297161.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/11143972530.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b254509487---tigimukikimegibiluvupefiz.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c572d3dac---nugodejerivunibe.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/kiwixuwekabidupami.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/filuranegegixemako.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/05813abcbf52643cdbb94d1179c3140a/39284586468.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/wulafunow.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/64501318052.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zuwadalitojupexil.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598151a344c.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c98ce247f---10004163101.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/kadoraroja.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/24cd7ee6de8884ca4c4f290152f6c3e9/sawumunofokezopuj.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/57855517484.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/gomalas.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_off0000b82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82D 14764 bytes
SHA-256: 46d7a9a645214f0fd89b357b8632db3a467bf6b3c6ea0e2e20f1f04465c7da77
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10884 bytes
SHA-256: 8c9545fbed7b2bcdc546cd07f6c626f44f68662b0e5a03d9f84d29db4aebb957
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1