Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4858f0c4d6090a6…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4d37f30c92276d1f9b859ad4278afe4 SHA-1: 1a9377d198c3b131a0cff4ae669da7f7c1dc73ea SHA-256: c4858f0c4d6090a6c4073e62590cfbdf3e1447bda41a5c65a7987e701956b80a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially malicious content via these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6ac2c932---wofepowivaxewotaxirujer.pdf In PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/71785412792.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wexifa.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/tadisobiteg.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a34f413e8807e986b7485b7b4664b209/47801736310.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0dced07d---lofaju.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/36989898053.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/sesusibojafofazugodewus.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3825cf8---vipuwuxuzonobixofawexob.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kefubonumutibanutewu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jefibewawesigodisorin.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/kokoliva.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/21285165173.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tidiwujifufudegigu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/6405048089.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f4149cbd8e70532c95890d033500a749/vuxawu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/19202283098.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/sujukejozevawipogebut.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3ghhkr7knri3d5okpme5pbfqp7/34126410651.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b3dpnf6d5491n4d5uc3omoju06/39296000960.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dacc045979---47875462350.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/felapakexafasosixusilidi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb52ada005---raxarum.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/44276162947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=urethritis+without+dischargePDF 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_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 10692 bytes
SHA-256: e16d86d17ecee2a0d701993157ca72c86495f83a182fa0a22e709e0eb63692bc
font_02_sfnt_off00013151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13151 18660 bytes
SHA-256: f27c9e6e81c3a51dacde73d1b1ba945f84c7b9c720026570a86f78265063c6fd

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