Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cca7f661bde71d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 16:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c1f95956f042e11d8893773ffafbbd1 SHA-1: e13f8b12f6be86a4ffbf7f9cac8839a778e81e6c SHA-256: 99cca7f661bde71d02b81250308bb7892adfbfaaec1a381d567e46e7f195250d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting, with one URL specifically hosted on a compromised WordPress site. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://5a.ro/ckfinder/userfiles/files/88079716869.pdf In PDF document text
    • https://ferado.vn/userfiles/file/kulefagizunivasab.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/gafasotilavaparixuv.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/fezuzamimuxibik.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16109a232ab6c3---sumid.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xanifegezewali.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/tonoguviwubamuwajukebuvil.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/9701178099.pdfIn PDF document text
    • http://poorclarescork.ie/images/gogegog.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8b4f3008264e2908e534907c4991d10b/seravekuwodewanetedizo.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/93039518294.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/bikorosasefolipiba.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/89470516831.pdfIn PDF document text
    • http://scarpatti.com/files/28776960081.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/96906296796.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e1a95c3e---52866223693.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0845f38d32e0ee3d7a0659bb370b0c70/32114734873.pdfIn PDF document text
    • http://keacg.com/upload/files/24460170018.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/58641795201.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/32921121070.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6fb9a777---nuniwuxubidasuwidi.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/95098041738.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/60244188934.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5936f74f---43644568755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=holocausto+brasileiro+em+pdfPDF 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10908 bytes
SHA-256: 065d2fa8d9d720e9e40ad3ce083b1ca102de90fa5788fc16e6f15f045a4b194f
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 19936 bytes
SHA-256: 9002403357372b3bdb9e1364b0552fd21a5fcbda50fce5a998fcfa5935acc39c

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