Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c00b27e4d8e61c1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 15:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0404225bd9e324d2ad99798ead072fa5 SHA-1: a4f848f5b46a523d2eac12f0d769f4d5321e0fc3 SHA-256: 0c00b27e4d8e61c159c8798a10b5e9363f2ccf3d1ad97564dbdbc95294d09c36
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on potentially compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern observed is the use of a link farm to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://1-cx.com/ckfinder/userfiles/files/38417229934.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16121d968239ce---69646370483.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/rawupezosizateto.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ajo3aqrrv90hnsisttuud0qhu4/20867010113.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/42536982197.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c825052efc---mafudunugaxim.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/61667867776.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/65521242680.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088807fde467---bogujufewo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/rajujadiwuga.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/sivagig.pdfIn PDF document text
    • https://posh.hr/files/43593833908.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ac6675a07ef417cf61026969bb7b4211/91600604786.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/65830135532.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/ladalibunurelodofomaf.pdfIn PDF document text
    • http://wohingltd.com/userfiles/40402381261.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/29069042161.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210507125815.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/75130683312.pdfIn PDF document text
    • http://blueyee.com/upload/file/251438236685.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f40f745936eeb81e30a02a9749b0fc28/wozedejuwozimeze.pdfIn PDF document text
    • http://domplus.su/userfiles/files/patuzaliko.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9ad2d95c1f50139b9285d1a05b1bdbdd/vuzogowokudo.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefulesuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cold+ones+merchPDF 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_off0000bb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB17 16468 bytes
SHA-256: 677117b3b9a6120fe302252fcf7c8150df6300a283f2551c35fb3b08a848b005
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 10312 bytes
SHA-256: e011f094f36e9476d563cfd088c05078cf16a034a320b87f3420dcf4ef73ac00

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