Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e609c76cfddcc74…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 11:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0dff2bffec1ae13c8a8a24cd17f5e701 SHA-1: 79c83b802663cb23cd0a222952b84ef725293145 SHA-256: 8e609c76cfddcc748325a3e734af28d65836c7897cb749a2cc74ac1f67c7880c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jofixutesijul.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/poxevufufikekebegexoxud.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4oh7kiqonrm7ovuug7ki8i4pnk/risobenujopisiropu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/197e8bac1e39122ca8ad3299ce11cc8b/wejapoxukenakuvazesesim.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/susopilususur.pdfIn PDF document text
    • http://devveb.net/userfiles/file/29042967736.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/tixokefanuxapet.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/18172470680.pdfIn PDF document text
    • http://atya.eu/files/file/fitisinajugotopezusiru.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kajaxirexujojalon.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • http://candientushinko.com/images/file/jekituxu.pdfIn PDF document text
    • https://tcremich.lu/files/files/zejesetobo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/reprsnqndis8ubhq7sn1cp8bns/wemogejibiveluziduvonivip.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28871499064.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090920334973499.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/lazugitar.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/damesat.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/23669739805.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/47386164787.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dolurisideremesasozovug.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/31106455201.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/bulenudepawe.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/68834953401.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/romuxigejixubovaxijifir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+messenger+call+recorderPDF 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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 10608 bytes
SHA-256: 734f5e88e2fca3d5f30f3178ce4f76d40653d30e2a90cfd6e8a581211ac3cfeb
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 17656 bytes
SHA-256: 8d6774ae73e318dacda3bc237e03053fd705bd99bc479fed66e8c0cafaf0c482

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