Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a15fba0615d0cd…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 08:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5956ca15533383b4ee448bf27e88794a SHA-1: d20c6137a8af6358f1704b5c5781335047587418 SHA-256: f3a15fba0615d0cd941ab049e2f8486d2f04f18c8b3d2690fb014311da4e4d8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=surf%27s+up+full+movie+stream PDF link annotation
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mujivegijonipagagap.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/99442334144.pdfIn PDF document text
    • https://oferta.lt/i/File/74449386707.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7688a5a---xatobakawavibove.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/revurukofavuseralepine.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39ba37d51---nalakufefekinufoteritipo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/77039374977.pdfIn PDF document text
    • http://mlight.cz/archiv/file/32947382129.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kokomevedo.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/basufirinilufegoxubeni.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131799be3059---wusosixasujesesutav.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3ll89joq91l5ccc7auqhhq1cnp/59154363156.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5d82e335---58481418438.pdfIn PDF document text
    • http://eventechsite.com/files/files/69104919774.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/xalumovejomidipapizijet.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafijunugosilizufexefawu.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28541615964.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6c764ffd---vugumugomamizinezig.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/14307274342.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/gikadinokojuku.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zatisasuwi.pdfPDF link annotation
    • http://adidravidar.com/ckfinder/userfiles/files/94453360563.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/xesagepigosavuz.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b2839678---79128409902.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 18048 bytes
SHA-256: 0aca9205c8e57869f8111848d1e725e29b264d74e36d9af9f1bb0e8722f32876
font_01_sfnt_off000125ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 10688 bytes
SHA-256: 8a4063cd1a9ab4158a219795b87126f7797bfe272394be6a1561c1ebcdad2860
font_02_sfnt_off00013e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1