Malicious PDF — malware analysis report

Static analysis result for SHA-256 676c988712024a51…

MALICIOUS

PDF

81.9 KB Created: 2021-08-24 15:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6469414bb0c77a002887f94a13511f72 SHA-1: 502140012dde36264e80a4feedaf249e106e6a4d SHA-256: 676c988712024a51b34b422aaaa1679471bbda85ba7c1eef734b2ab2e380bdbd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://coretry.ru/uplcv?utm_term=is+a+shark+warm+or+cold+blooded PDF link annotation
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/2862741191.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/ronotuwagufibunanelajoja.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059ba84541c---paselisijetimopove.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qs87hvdovvkl6e3s5hd0jeg1c1/96390652043.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e61bca323---45475250409.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/newatuxilodavuzasanunivep.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/jitusu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/vabub.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/83332279471.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/bb849eb8c2be7854a0fcb92099f87cc8/tedonowox.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fbdf2964---73070639077.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/janezadaxetuli.pdfIn PDF document text
    • http://e-hematologica.com/users//file/19425912496.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/92389312288.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e265f17c4dc.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/larefemele.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/19aeb62a9d4a2388d1247a7436479aab/gizuxekuveg.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/77449354555.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9f4d0d177da2a35f30f8a91fea7e6357/dimamevevufax.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jamuzomavutimuvupusoganus.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ve1iqf97ql1163138cub9n46m3/pogabazasemifizaluzef.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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10612 bytes
SHA-256: f4886ea74a21b5481001ba21b62db23cd0608ce79523a90b7730dc6a09cc1a19
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 16776 bytes
SHA-256: 7615671e6d41e14dc073211ac688388a7895c883148a0790667beb6ac91be1d8
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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