Malicious PDF — malware analysis report

Static analysis result for SHA-256 8931a3be650e6d34…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 15:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a8d4cfb02dcd81543cacfb7b01f8a28 SHA-1: f5f9283a4312f805f78753c3abadb812d80800b9 SHA-256: 8931a3be650e6d34ee5d02e9fc58f58febf982df90913df9873171756251482e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://1carl.com/userfiles/file/40612355638.pdf In PDF document text
    • https://griby.biz/ckfinder/userfiles/files/91408981609.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/36762909767.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/33469401638.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/66750400406.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/belaz.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/sakupawawexenawotiboru.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/16969011931.pdfIn PDF document text
    • https://izometal.net/mm/file/4168597351.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rusewunomozaxe.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdbcb00b8---15244116698.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca7a96ca7---46297444350.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913020104.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7l2hvs9igm7ntch8gd3eajpc5/58703629105.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xalazilewutobonaj.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/wojepebawujafegonuten.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-12-18-52-24-52.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/94179809387.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/buremofuxepokinemakireji.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-13/20210913132635954286.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/gepagiwuwapasujo.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/nufezigixeguripowowevo.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xuzidonorabugeriwogipaxez.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/putujibi.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/51657301652.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/40464791714.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34777867306.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkqlrdgde3b9lf4f5dltjuq0e3/14901960813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+auto+backup+folderPDF 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_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 18220 bytes
SHA-256: d4a9dc3a4e4d3da3e1ab67ab03c632c99ef5929cc258fa880c155b92b6a58789
font_02_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 10760 bytes
SHA-256: 7827318d7f5d62b5c6210b799ecc67dcdbda7b730c64c7f0365952b6a40449d6

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