Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a52f2ca08852f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 02:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb3c47a61ab5fbf7edabddba3b287290 SHA-1: b381f86d86347faed5e425eaa75f6d33f26abe4f SHA-256: 631a52f2ca08852f25a999ec9b940f47adf1ba9ca5c0c1be347cdf8d8359701e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=slope+of+a+line+given+two+points+pdf PDF link annotation
    • http://nhhs78.org/clients/63854/File/fenojigugopexew.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90c8598bb8---4991206186.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/76163000540.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021083010072121.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5369ac7243d67cc1c4b6005fd2a3e0b/bidekodaveniwavum.pdfIn PDF document text
    • http://dalaichau.com/files/52086901248.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160795d735c037---97788260766.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zebilixoruzikopebazoraguv.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zimunuzimofi.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/ximalofuwomamovatozi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1f2td8i5e70gg95penqfht4l1b/71848528902.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/rawoxamuvag.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/93863478756.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ggvjkqoih2f9ugo5u0j57bperg/firuxuk.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ec5b0bce9c05b24cca9086cbe064465a/14178784434.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/maxifutiruvumosobu.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/kazafegijufirajemisa.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafigoxojoxebuzelibi.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tujifomoke.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84816379616.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b8d7df30---73965619908.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/052d8d2447069228af5632bc0250709b/solovisixituzin.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6125c9d6f---tabegevefirizivepopinef.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 17304 bytes
SHA-256: f65492c6b526bda864ece3a16474e6468e19c8aa42a3772e32d2edc716d29b71
font_02_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10800 bytes
SHA-256: c10472bb59399582e1d23a5f9ae74efd80d9d1ec0f3260410a5503dd95b969ab

Open this report in the interactive analyzer, or submit your own file for analysis.