Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ad1f762d23da9f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b429f7408379706bc9f6bc0dbca57326 SHA-1: 300e1fc708a51577a6fd4dd26bad968d10d502dc SHA-256: 37ad1f762d23da9f80ff5f59d4e75ccceb7793dbcd902f6e227f7c84334f8fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeda24624e---18978700958.pdf In PDF document text
    • http://balone.net/_upload/file///renidexevovipabupikosi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9910f20c2e---95488941209.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/joketejufubavobelawotefir.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/vefojebozumevatop.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8e131df6201313ee96f4c5a08ba96ce6/zigadujub.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56237261487.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/mafipoxedapepas.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/vuxotomuzow.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/84737822880.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ff159bf0360ee3991a0a0764e8c96a80/tegonekamanosogipi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/ximorifikavagogizepa.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fazoparagamizutipeju.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/18408394931.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/fitadaxenajusituluno.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/il1haf7cm7almnrv0nos7tcrub/63822163694.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/wizipolulowaja.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/wagasuxalarokerug.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/85538340250.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5a4baa19---84810545073.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u48ea5rn9nhitajkm1gke2uf63/rixupe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bezakovubiki.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088e99417123---silidade.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a05bbd18a2---migukili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+stand+amazed+chords+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pitajewi.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_off0000d29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 10756 bytes
SHA-256: 338a8c9ff1b3a3395f470c035eddc5f092152e6434a8c7fef5d8330b1fc478d2
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17824 bytes
SHA-256: 6f0c12eafbda20a6e51c8689d384a6f3d90144702021cf148757e40c89f11cfd

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