Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c7ddfb03d27c7f…

MALICIOUS

PDF

67.9 KB Created: 2021-10-02 17:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1b2af104f3faf93a63744dff9942463 SHA-1: 3a71cf68b9ce2236a823ef6b790b427df754f0ae SHA-256: 80c7ddfb03d27c7f8bd38eb7696d24a24a52aa1898b85c8642559fe69c46d0d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://veaodaibrahma.com/uploads/image/files/14740703679.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c79baf130c343697a7c2e9c074c23b3d/71429439624.pdfIn PDF document text
    • http://xycrusher.com/d/files/vunawosozosogafudekeb.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/kapogosolodugovokaxej.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/vawas.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/71121167821.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2d24b6ed1---bidul.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/jujofizo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9256731b061a99efca1cb4b8ce5c6f06/39798607737.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161481e6b79dca---94288824822.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381d186ad07---sukajapomef.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/7135728757.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/41218316294.pdfIn PDF document text
    • https://datenglagi.com/contents/files/rolodovonavod.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/60014502869.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538767a9706---54715489105.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/12461380169.pdfIn PDF document text
    • https://cmf8.ir/data/file/38263662068.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xonon.pdfIn PDF document text
    • https://semut73.com/contents/files/84325267138.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefixaxamudipalizobulev.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157215690032---jabeposi.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/39781613116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=functions+c%2B%2B+exercisesPDF 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_off0000ad6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 15016 bytes
SHA-256: e74dd214003dbe997748ae28529647eaebecff47cee138146762e72d2caffc15
font_01_sfnt_off0000d347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD347 10192 bytes
SHA-256: 63aabaede9f492d141b53c108b6eef043ef5564a99885360d3886e9542a713b5
font_02_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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