Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d445c7ce1ac4cb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 00:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 869f3e145662a20a580670d997d80635 SHA-1: dda28ae1c03e70885df145362870ac335efa508f SHA-256: 98d445c7ce1ac4cb533b1f005f94e144609866d0c8e2ed0be40a6ad642962bf0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://fitviewer.biz/files/file/35141260086.pdf In PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/nogolazisevo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/86056175095.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/32395838142.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c72c927f9c---83450500948.pdfIn PDF document text
    • http://dominant.name/userfiles/file/rotubogaguzizejevowa.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/67772385709.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27592804081.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/14181479827.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1447f2314---83475097802.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/riwimujibozuxetip.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/sekisaponoxu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614254dbac2a2---90937783340.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcaa2e933---21873976430.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/94664719310.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sidigu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142226c91f45---mujazuzujov.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/65380140897.pdfIn PDF document text
    • https://davnosti.ru/upload/6643607923.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/fizulukobadamugo.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/48502696997.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614d084aa63fe---96030732040.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab4ce978b---nipojixibaxejeguwenilig.pdfIn PDF document text
    • http://www.farimar.pt/imgs/uploads/97563797362.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/sakubotezapemezugigo.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/79737273707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=call+recorder+all+versionPDF 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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 16784 bytes
SHA-256: 5ae605dbb958812bb5dd318038c77c1d1987899d036e5691ad4ea15117b0a643
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10364 bytes
SHA-256: d1c1ab6d06004778098bb81ffd2bb31713e90084f98549d686cac065330afe0a

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