Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4256f6c313f9a2…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 06:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7ef953773f6d07ac1de47e25a83a9d8 SHA-1: cab1bbc8d9a36293ec1f7c66f1a74557e028ce61 SHA-256: 6e4256f6c313f9a2a187e124979e00be030d147b3d833671799b44b0d8b41edb
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URIs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous links suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=step+brothers+full+movie+stream PDF link annotation
    • http://joyerialaplaza.com/ckfinder/userfiles/files/62796262990.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/87911220910.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24efe7322---55384725019.pdfIn PDF document text
    • https://maturana.cl/upload/file/natujolikogisokututijefus.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf1ce85d47083b1a13ea1477b410a5ed/30915338844.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65187748669.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fmkor032hinug2arunmmu31ab0/pevekivapijodugemawajetod.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/87280998294.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/sivaporenopekozesita.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/061651084960.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/85074733184.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/60548591327.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631328947_1.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/fijur.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nuvexajupexe.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pejej.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/nogijirezok.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210903115053.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c1490fb---75162027051.pdfPDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3496e76e6---22364942512.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/dexijonorofufo.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/84927913939.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 18084 bytes
SHA-256: 407b3e0a6f1e6d082e5a23b907b2fa371404472aab4ec9d5b338c6c0c49ebd8f
font_01_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 10900 bytes
SHA-256: 22598da249ff5942e2f87f81e98e610781cf8b7f4ab4a1611883574e55686ded
font_02_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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