Malicious PDF — malware analysis report

Static analysis result for SHA-256 1636ddef26682b9b…

MALICIOUS

PDF

170.0 KB Created: 2021-09-02 13:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b3de512ac524af6137ff08aae1c8841 SHA-1: 7679e4698ca1e8c32720f4b89f38173edd6aaeb1 SHA-256: 1636ddef26682b9b16868cbc773b46b9f41d4a89ec99ab2842e3d9b01624c295
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ee7b5c21---51177725939.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949878ae972---lonifuwomokotalibizumezos.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/loxonabivipezopu.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/dekizetivixamenas.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kapomuzefunozolofelaxo.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/3857306195.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/fisivalutirekiwekibek.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afddebbfc9f---20265199130.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503044659_1703025066.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/depizedoburanonukezegopi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/83414081691.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/80398510821.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71397356319.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/19243129121.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/4955013222.pdfIn PDF document text
    • http://xsteelstock.com/d/files/69296861963.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/zowulalarurokenalidu.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/55200347661.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/76328530800.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/bomonixum.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2dbbd7826---muvefuvonor.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/68afab9322d071de3e55f03c22f71374/44025394858.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wojerenuvogarupiwibegixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=biografia+de+ignacio+martin+baro+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E6C 22880 bytes
SHA-256: 6199b4e273b6ffd3473388b3a44d7d00f00e4f6f32cf28f2f44cae49986296cb
font_01_sfnt_off00026741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F58 10940 bytes
SHA-256: 484697668ba8ca1b70c10ddf222f6819f096adb08368d6255b8fc3317b6779e0

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