Malicious PDF — malware analysis report

Static analysis result for SHA-256 b415472fdd818870…

MALICIOUS

PDF

97.4 KB Created: 2021-07-01 23:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf200cb758d8170212a1e34d13c0ca79 SHA-1: 76ded4a8a64f85474f094eebdc3d3ab68e461e54 SHA-256: b415472fdd818870bd5ef15747c8faef5add9682c37fbca7ec7fbcb39191b4f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/94de4ba0b56ee1f8dc27f871b07a2c0f/kebamizufonesizivoliwi.pdf In PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/jikatasaguvevi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509091410473731.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcfa46f5c---nexagupobubukil.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fae3e5c9ac2cb32c670f2ad6864cf08f/dibizitaxukajajenupa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/be254046affd2f6dc190f81be21cd537/799998961.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4eb964b3---fegufajokipulika.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e10eb63ce---pageridega.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1fcbc360c104d6b1e92755d2afbd6a07/modoxuliribolane.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f5ecdd00b9a9c2fa885dae6081a30b3b/nibisaremizidunedob.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/k1dk3uu5gcujm5dieae63h3i8v/55715560317.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/namapuzoma.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/39080303074.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/774a9f3d1a1f58933066b68d0e8b6ede/nomawijixol.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/gavonolag.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6bnki7hkv0j1oe4qc8kih8dvo7/49956601986.pdfIn PDF document text
    • http://abwva.com/uploads/files/93259818423.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wivinej.pdfIn PDF document text
    • https://master-service.ro/images/file/5627243988.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b00e8d29f3a95c45e87bb58e15b855f/jororerididoke.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/49374871529.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ac6o7rpkok5q1s4q37mfpdi3vn/jipifoxo.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/pevagufagavezigozudok.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/37363451819.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a2d42b9e4bd53849f33256e19ffa4/rabatuwuvodisefumuxet.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44901988c---24333967804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=competency+based+interview+sample+questions+and+answersPDF 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_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 17808 bytes
SHA-256: 3620360651379f17abb1f6809fdebfaf8ac5a49ad21422276e4e0138a80f38f1
font_01_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 11360 bytes
SHA-256: c7c6d8d0d6edfef95253d905737ad5528154d2392493be4578ee50e99ed628b5
font_02_sfnt_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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