Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd76e3be794e0e8…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 07:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3082e803da73da527c62772c072071 SHA-1: f3a61284d2e32d397b3ebdc1b4ad778b576f3aa7 SHA-256: 7dd76e3be794e0e8b96a7a390be1722e534b240ab4644343673d6b9be59721bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a deceptive web presence. No scripts were extracted from this sample, but the presence of multiple external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mfmd059i1qcao7sllv949sdsr7/32766101129.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/rifaj.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/19e65d8d5f04562681e9cf12d3b4ccb5/33163653733.pdf
    • http://misosmile.com/upload/editor/files/bigojegik.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4272526275---jurogife.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99b8904a3---zumapawemesivilemezur.pdf
    • http://balone.net/_upload/file///vubomuxitapisutefije.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077096081594---35177579358.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089efdb0eded---77459603434.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b2fafbbb1551c42b285619161761c134/30043714152.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f62473693---bevekalejepoj.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e1904b903b0f10c031a1363342c086ee/69493584207.pdf
    • http://gleneaglehoa.org/images/file/vegemupoxexudosugobu.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/01c4a4ddd5e1e239f49f0d65f8c7caa2/15757051335.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/890d46299099fdb56c3a6689a681c24e/deralu.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/42194352732.pdf
    • https://imagebeaute.fr/userfiles/file/2120491128.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8a80a619c---watosufiluzijevadevabal.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v8sqlu360ar1sf7mc1kllb9uqs/kubefisomubufodupagonupol.pdf
    • http://e-hane.com/files/japekidajunovopa.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160793a19ec695---xuvezuw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26aa61d564---sedamebori.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/46070538849.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608337176618a---83016481258.pdf
    • http://flatadministration.com/uploades/fckeditorfile/wosifemidafapuguvabaki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=profiting+with+iron+condor+options+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108b0.bin
16580a031f2032b842227698d7d320f4ff3c6b570653bcf18b59a5f390b9fd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 17916 bytes
font_01_sfnt_off000137cf.bin
a09738f0c0c5bd1fe75913db888b9cd728c7e342b7b42eb9e94d29bdbe07c72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 10648 bytes
font_02_sfnt_off00014ff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF9 16792 bytes

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