Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c99e09082f79985…

MALICIOUS

PDF

71.6 KB Created: 2021-08-27 22:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cc0f47be4b22667bf645c1842f976b9 SHA-1: 210093c65a602788c6729c6bc237287f4193dda0 SHA-256: 3c99e09082f7998561e70f32246845fea5f9e5d7bd5e794a9d86c58b59973a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=good+morning+blessings+for+a+friend PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feae4ca32d---3759758005.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/23152457921.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/34v9vnifm08cliepk4a219gups/sejemubagutuxomebigavori.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/28258946214.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/ribanopovodisiwa.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5ac63740---dapinapiw.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d5df057e---76500923131.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d6e06b6b3e9aa437a108bcd29e95463a/37237236327.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3e5130d6853d28fbd9de1963dc441787/98514219614.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/9rgl22iqujggmhaq0nfu6cekdb/87889654558.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/86088680587.pdfIn PDF document text
    • http://sinoorchids.com/image/file/36135169823.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e628767bd19---11044746918.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/rijad.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/63025690121.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/gutipekunibefaxaz.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/rozexoxovo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ca4dd053cefb1ddbb90fafc7d4fc3340/lobafojumukiwotubuzat.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0b1708bf---30119908651.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/86604720486.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/bikilepagapi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/13896489890.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximamurewuxiwivepibutuz.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608302333e9ef---40831864912.pdfIn PDF document text
    • 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_off0000b8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AB 15460 bytes
SHA-256: 2c9ff134fdbef5b81e137353fc9be0b29cc083fb9826a231a2e2b59e1082abd2
font_01_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 10780 bytes
SHA-256: 40cd407c3306386a80fbe6838ccd76c9a8af29dd9f65b802b0c06d45e8458f65

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