Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0fb390112c18a7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 03:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d42f174ab459401a465a0e11e09db25a SHA-1: 9cd7a3ae3a0426b848b103cb5a4997a36d44c219 SHA-256: ab0fb390112c18a7856a4038a19dc095a7cdeed8e2cb9adc31bf9173e10dafbc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload directories, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://firewheels.pe/userfiles/file/minumisewevamoti.pdf In PDF document text
    • http://hotelniagararimini.eu/userfiles/files/84331238708.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/17ef8d7a79f3c2390d050217dc973d2c/doxulabuwegezufakinaki.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/29b40e4ad6bf0e9fc73da9507e240a9d/pipaxinebenufadojidosidin.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/2806829512.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/volokulu.pdfIn PDF document text
    • https://svltv.in/userfiles/files/jadozizumomevodogar.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/gubekumoxowavagevoxebopa.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/43139885154.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/tmus1kljvnc6nkdmujojm69g13/61853077439.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1831c391ed---wutixax.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3b567759e---lisimijawozobedamimenuku.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/95919386362.pdfIn PDF document text
    • http://indel.sk/userfiles/file/44657175637.pdfIn PDF document text
    • http://tchid.net/userfiles/file/juduzanepudobuxuzigizu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fokubade.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/xetanilirogaguz.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a715422ed91---fosawove.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/mewefi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1cb9e7be94383202b00e3463dacdcb16/jemanesol.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/10615608305.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d503938072---33578721737.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/nanej.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ddd30661---xagiziteganadetug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=shimano+sienna+fg+manualPDF 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_off0000bc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4E 15896 bytes
SHA-256: a4d3d9876e567e43145fcb59a71c3e0a5b8ede806c4dfab9cb11f047c4c9de93
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 10636 bytes
SHA-256: 5a630cc8ebc9ff837bd155cf1acbd4af39495c05dc9d7d20346109a0507c8dcf
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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