Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5328eb4fa38f18…

MALICIOUS

PDF

73.7 KB Created: 2021-08-15 15:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62f39dc47f404d627b26c68f78d59498 SHA-1: 4159bc793c31cae4dab47c7b6850d67c85082d28 SHA-256: 5c5328eb4fa38f18628eabb25aa838733d8e2d5116c39f7c0d71074513b768ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate it is likely used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4a419defccee697a36a7f255f05d54b5/7911431864.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074779e20589---kegesenanomijap.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e276d97000---tujan.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/38733416231.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/44104255509d046760b0f8e05b03a147/84583390490.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ef553fa624e88e4308b67c4fcad4b0c9/77763086898.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tosuwutalijufiwaguke.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pigaw.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/55456808623.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/gefabisudelukozek.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cfaa08539---vubidipavibumewok.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u6qqve3ufirqq8gqhk20gq9l4/95001256174.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/zokenet.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasawidaxufubimaleso.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/49831261292.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c98e080be0d---wakegen.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610950b6f10ca---suvus.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/71019087001.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/xadalovowetuwuket.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/pigumilegaxire.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/16328020989.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7744c06c7---728609927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=harpa+crist%C3%A3+cifrada+cpad+download+gratisPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gerimulujiduge.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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 16892 bytes
SHA-256: 1910a996dcd8ebc9a3770b5f489bb1a7b0c1ff047f941aab5474f952adbaa65d
font_01_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 11008 bytes
SHA-256: f46420f079adde91a3967b42f1e036f0e08a686485b4bdfeae8669c908fe3f93

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