Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b63f4a0435c398…

MALICIOUS

PDF

88.8 KB Created: 2021-08-18 15:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e0b59c36ce288bdc5e8f7a309fcd75e8 SHA-1: 37e899d6b7f002ca18339274e308c348ed43881d SHA-256: 96b63f4a0435c39897ddfe7949f47eaaec1cfd8b3eeeac97258b1d48a94f96f8
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://sugarfree-gelato.com/upload/file/8063586726.pdf In PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gedopozax.pdfIn PDF document text
    • https://grancom.by/upload/docs/12638097211.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jesibabu.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/29287535828.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18356c30b---63999521136.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f9d30cbf776b13d67990a657da07ec0d/zulesonijukaresawugami.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/68253250072.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/nixalajirajoviwexig.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qn8f1g6v7va0hu5sel4a6ui0cn/tewewuvojupowumetib.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce17dc1cfb3---joxefazobejekonapukuj.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/80061221358.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161009e0bca2c7---sebobozepisipufa.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/29310150357.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd68acddde---57130442738.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/8480975324.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/99909444374.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/tadutenik.pdfIn PDF document text
    • http://dalaichau.com/files/wexukipufabugaroja.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/83803180525.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d42141b6---sotowiwalosekuwowavudon.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/26d7bfc5d08f92bc4d08a35d4d4aba9b/87799198074.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fc490c1e949fa14e1c0676a5246b542e/riduwexuxidusobeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=does+ian+come+back+in+outlanderPDF 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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 17312 bytes
SHA-256: ad7c0f3f152e07c167975c618767920cd802e00434f3e02cb0246e707fcf5e1a
font_01_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 10864 bytes
SHA-256: 0046f133e9e7bdf8c49e92db45232eb3e7d51bf856287b2960ec4662de3b87dd
font_02_sfnt_off00013b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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