Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea139a7feaf7cb7…

MALICIOUS

PDF

93.9 KB Created: 2021-07-26 09:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bda2f5195ef9e33880627a0de114987 SHA-1: b35127a4dc169f102654638afde595ecb7b92b7e SHA-256: 9ea139a7feaf7cb705266b415cffbec0cff46787fd5c47b4d3159def975381c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The PDF structure and link farm behavior suggest it's intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://budapestpainter.hu/ckfinder/userfiles/files/39688334717.pdf In PDF document text
    • https://mmszke.hu/files/file/pirorujifira.pdfIn PDF document text
    • http://kgmda.com/upload/files/15566062624.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/56860978644.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kpmmit5ch4eadnpf3ubp5nbqan/pipebufomaxadajowug.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/38e422d81d2b404743e2a06dc2ae42ae/dawokugevaxas.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mimeferewaresuzema.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d352d9190---jagekoxizefulumefowiboje.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2d19309daa14329304332bb5ff476f98/42988626441.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210610195056634949snpryw.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9bf62c71f---savibox.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b1169c05---zagodezebujo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74765cee542ac5fcadddd3df60dac650/61495421208.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/94511914808.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/vozag.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6c9a57bbda99cd69297a081ed291151/paniforox.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94c79a94a---vezidezokowida.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h97fmd1866udu91k80kmcfsvc6/44186712585.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/vugejaviziketukowi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///lewulowes.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qhrcj5bee6v18q0oa1o2aei735/fotamagevuxoje.pdfIn PDF document text
    • https://bio86.net/fichiers/nonak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+can+i+substitute+for+buttermilk+in+ranch+dressingPDF 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_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 11248 bytes
SHA-256: cf200a9d4252334ea7ebf8b03f79a13e31810a02b2c56024547716306bc671f6
font_01_sfnt_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 17796 bytes
SHA-256: efa2ca8964401a428fc0268ace9cd40cbe4012d9a4fee0f68c3666b3120d297b