Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51b5b9977590c3c…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 21:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6d7da220455a7f845e2fd30c6a3cd38f SHA-1: cb64249ad80ffe1cf9f264fe5d6fab85e396a552 SHA-256: b51b5b9977590c3ce0ff7ff503ddd93914dc060b6bacb4fb84e6a021c817e454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8820d72e9f06fad1dfdc00c85cc35c28/63966225973.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/529dc355449210130f16794967bafd13/31904225774.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b774d46c7---1734304430.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/78555312855.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/99404743604.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/47iesau68nunofclhqde9v752d/lobegudasiruniniv.pdfIn PDF document text
    • http://learningkey.org/userfiles/pozaresukoxegof.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c7d2b13498bdb246cd3b2b2bed9eda94/jemiluweliwi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/lonotejefuvolix.pdfIn PDF document text
    • https://superpart.com/files/71057055465.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/sepoxemosojonapusawudisi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d84320965---xexomafiwejadej.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/69549773648.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6911389645.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sorewujatonemokaz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l7t9a3ertn4ncd81op5ti7n6a1/wuxawatevalixofobotuxozaw.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a6a4f04b---29652304362.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2e1ee262---15913240823.pdfIn PDF document text
    • http://poorclarescork.ie/images/80118654292.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rizifet.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gurepanafazizozem.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c33050114f---55803594244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=class+8th+maths+solutions+pdfPDF 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10868 bytes
SHA-256: 7019469ec5858a24cdf08a0c8c1818421601a923199c141887b0127e3930c157
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 17536 bytes
SHA-256: 7cde424ca0ea498caeaf49c98c632b6efcaaacce6aa35209e9b510b058b24498

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