Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb386c4ce397a84f…

MALICIOUS

PDF

86.8 KB Created: 2021-07-05 08:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a4f62ef7a37402005af9c4a74d144d0 SHA-1: b50a86e30c04e8d5e16c1879eea5631ec10a1913 SHA-256: cb386c4ce397a84f125efa60e671e1eaf29625d7c0ae0ae2eb62644878a44fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0213bc04---buromevasif.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97d732a56---86852906250.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/89597390091.pdfIn PDF document text
    • http://www.emailposte.com/pictures/77269067818.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/02ff8c9c2e00473905d632734912f8df/bopulobizapisij.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13273183399.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c81cf6835c4fb411b4b1f2048c41a922/dikefipi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086655a8f5e8---886899478.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/33c9c97d9c81432a4f4424d8783d91b0/jejededojo.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/96573370f6d25a048371926cac0600e0/punamutugujiwekatikavi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/mu847lfk2e6dtbr16idcrafdue/36277211743.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/garirizovazorepa.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/foniwipelovijojonafifal.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/96016673391.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a35373bc5---tepisewajuzo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m6fb2oegv538rtu1etkljv3mjj/gawetelus.pdfIn PDF document text
    • http://446888.top/userfiles/file/25244457345.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/sobulumi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9a2a3dcba25750ec9bef2a21af87771c/makexosolexazekatozafudu.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/56413223474.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/20889363832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=desertion+meaning+in+family+lawPDF 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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16976 bytes
SHA-256: c3590219a96ab7f76ac681ae2808566ba3bb9b1c8e27c2f0611f93a00137a244
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10756 bytes
SHA-256: 6934caa949e254dd3ea7b4760ebe1e7b5bfe592083f9057bc86392ba741f8d84

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