Malicious PDF — malware analysis report

Static analysis result for SHA-256 359956e2fbbb5267…

MALICIOUS

PDF

85.4 KB Created: 2021-07-08 07:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 31aff4959c00f17068de0132ead0bf5d SHA-1: e915d59a41f6af4d931dada1004f11ad87277052 SHA-256: 359956e2fbbb5267062b7bc1ec2c05b4436d09feaa70d33dbe6a0b51e4adfe39
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with multiple distinct hosts and UTM parameters suggesting a phishing or spam campaign. The embedded URLs point to various compromised WordPress sites, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ed930b0542c58bb23a95d537cd3d4dde/47354137073.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8aea44fcfb521dde58f29fc1dc61d908/kurujegilebavu.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/vetegejufu.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/09cb4fa885aa964060fa4b4af54a5c40/goxutuxojitizemi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3cd56850---netagubevokoliwixejivepe.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53f8e655d---62940509524.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///pakaribagofokapugibeduk.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/35589204024.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2f071c0c28ca111ec3b37967c55a6e56/33810838762.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed053a5c9c---gupusezabesirodix.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d5275ce2---zamegowepafodogivovuxazo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/smr6n3cnhit8cijv0l209j5eb7/76891661544.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/nasusilelupegobu.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pizuxatimikexelopesagiwov.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/wunavozoxodixufeto.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4a3bbf19348d0ea18535e02e22bb0b19/vewakuvolireg.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/xunupefapamotakofob.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a44b089404d---11357154710.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/44973713068.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/jevoxazekosovo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a87c86cd---kopotesavulizokeligoni.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989e62728ed---36165265841.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/55241286414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+nas+stand+forPDF 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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 17316 bytes
SHA-256: a15efce461b67f6a6326be288359580ca25d15f6c1557d28637bea0ea9a52a9a
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 10304 bytes
SHA-256: dfc3239f1f5539be8f141de1efc2da1d15d6d03d8a0aa1fd41b45c3aec52cdc8

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