Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9f70f2216ae0de…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 10:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f994af19a1ee8dfa7ce1e540742b4e4 SHA-1: a2dadc800410b6bb5f379bc63275712cd433f80f SHA-256: fb9f70f2216ae0ded09884067ba517943754661b64d889072c7b8738ada28657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form link farms, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic to distribute malicious links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/42727049091.pdf In PDF document text
    • https://greenways.at/userfiles/file/6234902895.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/1j90kepo8hvjvqnsnsavma451g/xuxojetefigozuwomu.pdfIn PDF document text
    • http://getem.eu/files/file/sovuvagup.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/vupiwaxokol.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/xuwijik.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xetapoxufojugukef.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116068ce0c36---wupibavedagovuwo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9chtvbg5c9gjqe15rfg0gid71l/kuribidesaro.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lowasaxanorewuvekuruton.pdfIn PDF document text
    • http://vkts.se/userfiles/file/65475441131.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/navemedezat.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/31392952089.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/gegerowukikepudewowij.pdfIn PDF document text
    • http://palami.by/images/file/6004832068.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf960969c7b---matovewifuletononixuwufiv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1e17e546---kopowosokowo.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-31/20210731151537341119.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/17457765760.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/famesoxemixubuxazatofidep.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/64881134932.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/pagozigosexikak.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/lifuzerufenadokirobiw.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/10277267702.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612374b2072f4---kexetiruxamika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=service+manual+ford+fiesta+2011PDF 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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 15888 bytes
SHA-256: 917cd33bf4eb3a09b94846313690663098d61766ec245a44075af0a2c87c8e41
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 11172 bytes
SHA-256: 39c975187e77e48d67945553aa8f18fe918c4a22b654f24805b0e19011aa7c2d

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