Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dfe767a966c1e0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-28 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68a6a268eef0df38020b51dc9280976a SHA-1: e15a8f979205b576eb041cb838eb98087f45f35f SHA-256: 85dfe767a966c1e04317b07cd4a4d102f418a1885ae4c3a10a62113f9eabc9a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests it may be used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://synerhu.ru/uplcv?utm_term=car+simulator+vietnam+hack+version+download PDF link annotation
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gutexikaza.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/susojod.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/lidubiwuvikabanipor.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416295926df---zeratos.pdfIn PDF document text
    • http://www.bash.cl/media/file/xaxopolozufinozulunef.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/dosazexibetedoxodoz.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/vunulijipuxedijomus.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/kekijisejadojuvuw.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415af8b72b8---22352303941.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/kemubolidezo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fisenabunuzezevomeseja.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/1142872653.pdfIn PDF document text
    • http://rsentco.com/upload/file/42408780055.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/popiwojanotefazos.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/tevegagijoxava.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210916180128.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36007016936.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/9960848150.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a942222714a548472db7a111f1296e8/luburinijivibuxumizufubir.pdfIn PDF document text
    • http://fohow77.ru/upload/file/48552797076.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pumunodawowurenubevadifo.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/40903126095.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1460c1da---66363836865.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/40490230796.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_off0000b66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66C 11012 bytes
SHA-256: 0ab26f537b8c85bfc6a2cf8d6115e06d216894b1bbd7745c9c5b52986809cfbf
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 20084 bytes
SHA-256: a6625191859b3da391c1523b94f6797fdbe6bf48a409b278ce4a4a6be4c7524c
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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