Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f5270315fb3cc2…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 10:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbd2616dae88a7fbf2f4f8f4acfa4aed SHA-1: 89958d442780fbf76f2359f044cd32190b33cff7 SHA-256: c4f5270315fb3cc28d8d9e5234c9dc72dbef118dc4618eee2989925ad501e953
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/u82kv2noqmbdhj6lt3sn40pje5/kerux.pdf In PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed30e95e162da7efe94ee1dfecec2146/telewu.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/popunepu.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/55aea70374b3d2b189bb45b48bb2b33f/57520681999.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/podawebipupez.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b88557804c9e0db27e24b1a9755bc9c7/pogubujijow.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/26b61c367cbeaabce01b6e4a4b177577/mofasajevufezaxililijaz.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/kb8co40ada9a0fmbmcv0up6754/tulumuvuxajerixu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xomelebufevepasanexulufad.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/61219558830.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/66535182118.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/kinorisavaxiluga.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/16bed7c3d970373125f000c934001162/34888725123.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7111baa0---gepugizibidifedinudij.pdfIn PDF document text
    • http://brlairport.com/images/file/13391576477.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/61772399269.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2d6d0ba6---36646506709.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/73894735e1df77a9e69d419df8f333e1/89854098571.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/832050493.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515132235529231.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/73102052497.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a5b68fb53e4700ce135a6d4f3cb2fb31/xovuzaw.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4d9dc4f4---risugid.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7f658182---53758253789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sybarite+in+a+sentencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cf0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCF0A 19320 bytes
SHA-256: 8bfab611f888df38ca298ab9c42438548da821eca29eb981fdd514f77f5254e3
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 19892 bytes
SHA-256: c38a0067fb82e00790c401cc0d450fa8bb02316771a0bdd5ef59a7457241b0ed
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001396b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396B 10384 bytes
SHA-256: 167367c94feee01a43added53f7ce7bef73f29715afbb0607e3d280b5d8f58b7

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