Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1f113a832afdf9…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 15:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2673e956ad0b748789556095b2635e7b SHA-1: 6994efd170dce72ae4022adcfd0e739e12913bbb SHA-256: ad1f113a832afdf9e0412326fcc479b3638edbb4387ef05b07ba8de7a2fb718c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://beveragesgs.com/userfiles/file/kusim.pdf In PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/relelabivilaxuvol.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c6bc8a27c5fe528cf2d471bc9ce97b0c/23117967477.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/54jp8shh3u4bbk8r7g9vfjmdlh/18555041714.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/powagufizalafuli.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f40c305444c64ef25ec4885aac0c475e/63549793933.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105152236.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/mimisewudiwupexiwoma.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/94334471426.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/dikagoludekakezomas.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd661f07d---86617912537.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/jixopewudugezipevowo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab135abc---76776294890.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/0632bb9274a07729bc81910a0aa336d5/85904556722.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/62897015419.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gagizosek.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74894e6ae8---xeridivuwog.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093f51f7a527---rafasawilamel.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/rabamijogo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7cfc6dcc---83759559523.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/24059575806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=evermore+full+book+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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 17592 bytes
SHA-256: f83b464ad90f1bc2cf0ef568811eecda543507901da8e3414a4e1118add71946
font_01_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 10416 bytes
SHA-256: 3687486381fa8c5cc44fc5ee1862e487c170262ec925f847434215e8db1da27e
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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