Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c082b833831416b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-14 06:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55c68e86e23d6c7d28353b7dcdd8d92f SHA-1: 3c1b17c0673263ff09f53a453b812f44bd7965f2 SHA-256: 1c082b833831416b7f9a13aaaaf611d47d3f4beb30fa5f9f92c92bc571e0a8ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=letter+of+consent+for+child+to+travel+with+one+parent+sample+india PDF link annotation
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/89070f3c3d051ffaca2385fd0d34b947/goripesurujupebefubuxigab.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d325b32b---mijadave.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108102316061689.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8546246716---40310873104.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/96303068661.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/13104918121.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/38854470946.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac534a223---67610110607.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/vuwojefagusavirifo.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/lekaredeladeji.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/94030105151.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/tapure.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e99783806---biwodomovub.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77e8597a6---57688464650.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/98374790403.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afba7cbfb---78989160391.pdfIn PDF document text
    • http://mfcpavpos.ru/file/70420756994.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xelemesu.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/garewoxob.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0262c7ade5---12118357977.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900ed07cafc---makoxapesulupozazij.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kelurarowus.pdfIn PDF document text
    • http://friulanapanini.com/images/file/fezago.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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10996 bytes
SHA-256: 8cd4ea16e8eac5fa528c049315e81b83b92b6e478e0572e8d69d1ca6c3a8d54a
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16664 bytes
SHA-256: e8d7263330fb14c5f5ee05486f69f40906ca25fdd7929db4cd5cd4a4ea2848bf
font_02_sfnt_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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