Malicious PDF — malware analysis report

Static analysis result for SHA-256 963cb6596b012d1b…

MALICIOUS

PDF

83.2 KB Created: 2021-08-07 09:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0f559589f6d5867b25fa3e8f68a2e55 SHA-1: 4170610408838fafd84f2aeea15447f1da17aab0 SHA-256: 963cb6596b012d1bc78c91caac6975a26f60f726adcd149a5dcec58f29f64182
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fae12e864---jivufuwanagalatevo.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/df0bc3b531c85648e61f4a5e75e61003/gikenanejotawegis.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/43813818492.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/godezoketitodexogosug.pdfIn PDF document text
    • http://medica-brno.com/files/74599910483.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/zalefitexisominatuvirefuf.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nedavelobabadodutorufe.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/namuvidabibamagoxafekofa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f2938066b70910123474ea7e613916ad/menozebavidob.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/movedatimodotizunejumudi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160727591c0d35---35384531618.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/dopegasewamasizipazevozom.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/fosabopalifufogop.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/magonijalosezejigul.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8bd45c54---sezeladobotesedowoge.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/52661456877.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87153da40---robowomevanovipagum.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/57999338077.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tevijalaxazuwi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/31924051085.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3c13c7dc51d0f7e7ea1da76778b9fe26/rijafurebotuxunorubak.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/96861636945.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sobeziratev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=operation+alamelamma+kannada+movie+english+subtitlesPDF 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_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16980 bytes
SHA-256: d25abcdd2a53be1b46d7df8e9ea3f66cf48fdca472420502e20aff3de9fac8bb
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 11260 bytes
SHA-256: cad268cb3e2f88b1d8600e988cd33516b6fac1576cae992a9860da7e6c02f5d2

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