Malicious PDF — malware analysis report

Static analysis result for SHA-256 916876f79b5d652d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 15:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f72e33eea8d691d86325c009e8045d8 SHA-1: 283bff5cda95da6a0fb5e0b47392f22cb2a29f2c SHA-256: 916876f79b5d652d6f15ad954ef4956dda8e4bf830506099a58d8f9f0ce0b7d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/68ca1ec201695559d6d5b68432f7be3f/tudapoxavusuwuwedad.pdf In PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/51180801075.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/foretikoxaxivoda.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/85728716420.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37141237951.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121588b13dfe---wugiguvogosulemezajuro.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fa375cdea2ddbcf5a2bf7c9897f8f9e/88860122257.pdfIn PDF document text
    • http://18554080.com/userfiles/file/ruxibajuxijabu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160849cddbe4f2---62833563137.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f804c8b48a8---78631751065.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbbd94faf---dixeki.pdfIn PDF document text
    • http://one9five.com/userfiles/files/mogabifijalupizaz.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa95f87226---rifotarekadelowex.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/sikuf.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zalipaviliwatugiwen.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/27920109100.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/11780819646.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/fefid.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/60420329966.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/waxoruvifivuxavelemeso.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f884c19b70---64635501772.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210708_5613A5D1D49E87A6.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/gizojupuvojatawo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/42ed26d58187b813a3ea2d1c227013c6/86858644673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=corte+de+gelo+e+estrelas+pdf+tumblrPDF 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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 10916 bytes
SHA-256: 1037ca72bcdcbf383e5e80d323ddf5253560658c87a41dad83d7528f2713ce04
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 19020 bytes
SHA-256: f2e9a77185788c47dca175008cc4b15b781d6b0349a9be7a1b076a8a1cc475a9
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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