Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8fe52680605761…

MALICIOUS

PDF

111.3 KB Created: 2021-08-03 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 546588ae9536c6eaba204089d888034d SHA-1: cf7053f09c38df0d736f9d9a293cf172b290cf60 SHA-256: 7d8fe5268060576116d5b232604f6136f372d7dc5325343333e3103d9215dc88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784b6fcd3fb---16278429674.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a2f5ef85---34512325634.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/napadixekijuniv.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/58373603296.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f92d9d238---zozonowigumoz.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9563e23bc---zalusaxukofibufekavixisu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/pafogoxidiwafixovavul.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db88f5ab10---zaxavido.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/faxorefefemuzi.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/84052897869.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xoteda.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a3d3acd9---44284169332.pdfIn PDF document text
    • https://agatanorek.com/files/file/44495196710.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/56f4386da8e13032847cd244fc928fee/44205952025.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zenipekilo.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/witoxigubokom.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/90707357855.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/jukudilojikunalegeka.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/16581102216.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcbf20255---vawamolo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/65321a661ccc398187c3658ed1617396/83207943736.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sevar.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/28220071144.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607877cbdda04---jamotapufewodut.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efbb44713---kiwopunimibunelokenex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+book+to+learn+astrology+for+beginnersPDF 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_off00014fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB7 10788 bytes
SHA-256: 6bca7bd50e40d7dbfee7c564df6a7c08a3449ef863660266a460cb0f3e1fd3dd
font_01_sfnt_off000168ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DC 17680 bytes
SHA-256: 91bd326cdd4c56f44a721829c6bfb46c0638368c08723f66476b74b37e5e61dc