Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6c3af65bb22974…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 06:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67c4405e96d566a2c385c6d1d1f8ba19 SHA-1: 92f8eb895bcde6cc6a76a12c9c0db4428ad2733f SHA-256: 8d6c3af65bb2297461ce30f171f4082aa83ce53d35e140fd1f7c6ee74aa5200c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to trick users into downloading a malicious file, masquerading as a movie download. Several heuristics indicate the presence of a link farm on compromised WordPress sites, and the ML classifier strongly suggests malicious intent. The ClamAV detection further confirms this assessment, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=the+mummy+1999+full+movie+download+720p PDF link annotation
    • https://geniodelweb.com/file/56547458019.pdfIn PDF document text
    • http://iphysiology.ru/upload/wuzelexe.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/cd68bgk633sfkjqg5sbtjdcsk0/sugoweki.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82b8ed81c---gugedosafudelipobefed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4866358b8d---70985028617.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/51b957e55b4a721b8af127b4ebbca21d/39899412615.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/84767699723.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmnbtji9e4uv1i7mo29jdob9o2/kumonarujomumirovub.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • http://lblussana.it/images/file/ludano.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ae164544e4a051a1dec725216e610d9e/fekitadunipizu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4450808ac1---62762039026.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f538036ebf---ziluniwuvewikiwemuponak.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/21061552973.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/40373015978.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/73126084852.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xivapagone.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062716264470554.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ee1a54a30ee33f5aa24a0aac1529cec2/86170174865.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4190758b71e0e91f9b74754f629b4e17/19598424135.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ea21a4e7---zavebaromolituridinipad.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc351b174a---fezodus.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_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 11236 bytes
SHA-256: 7baa6590911ccdab59dcd283c6bae6619b70ac23f8441296b913b70b7bd30c7a
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 17304 bytes
SHA-256: d7a14e9750dbd7d811dcf2bd93375bbfc13469954dcc525d86725b6dbf4dc0d4

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