Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc568f3b414e9473…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 17:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28fdf5e35f0b416d54ecaab5e0e53647 SHA-1: e7ae3a1db7d6f3362b53d3600e2c434ad53282f3 SHA-256: bc568f3b414e9473c15bed24bbd73957171db40fa241c78f32ddfeabcae4c0ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'PDF_URI' firings strongly suggest this is a phishing or malware distribution lure. ClamAV detection and ML classification further confirm its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the document structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=squad+strike+3+apk PDF link annotation
    • http://fivelscope.net/fckimages/tuzojeg.pdfIn PDF document text
    • http://banquat.com/userfiles/files/totafanesilab.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/zikawuxuzafozav.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613643b1759c2---16225388564.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bomisulafigogarerel.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/29897104434.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20402718678.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/76540001917.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/rolesoxex.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bowagixajex.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dad408102.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/77141369163.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/57467027674.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/jasokuzuketa.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161419f76268f6---dapawozakavesorages.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/88221657693.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/65770111966.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/digukodetikimebob.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/mupizolajafuwufax.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab28f29bc---paxekorawit.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40690067670.pdfIn PDF document text
    • https://tigaintan.com/contents/files/pebosisuwabetatudiguju.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/74267293758.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/82272045147.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16876 bytes
SHA-256: bc59a95edc3f0c138e39070143b5b41beae4a9b82eae66823585504ddca2ca1a
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 10700 bytes
SHA-256: 99f5980a5fdd56e9bff41389092a0fad5fa2a140e51c25ea7a96e4838a572085

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