Malicious PDF — malware analysis report

Static analysis result for SHA-256 36472c5b217ac316…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 01:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 693e334bf528d425b9cbda63f9895640 SHA-1: d68f97a44ca98e2d8d22ed787593faecae55ef6b SHA-256: 36472c5b217ac316032af2ce9dca5d38d9aa9544d0536fa35464ad32f187dfaf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm designed for SEO poisoning. These links likely lead to phishing pages or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://kimtuong.vn/isc/public/files/fckupload/file/zepegobitamafunaxoje.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f675d5fbfe---wutaruwopuf.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/63586856898.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ef1afc05---46943031082.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zukoduwizeretazike.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a5ed13630---vikiz.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f552b5bc78---pisitefoxi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/monejezu.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xufuvete.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/imk5p7qoum647vhv4gg3qjk63t/nazijipotetidukomu.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/52096386969.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/kukisot.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/sajofuvilupeguzesomiw.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/76561000171.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814067b3e1e---daporawuzetaweketepaz.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630134284/files/46588908711.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a013a0120b1---wogonuse.pdfIn PDF document text
    • http://rts-3.ru/upload/files/52461094372.pdfIn PDF document text
    • https://webmenuplus.com/images/file/rezepiripaxovi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6c1dff29---47565782923.pdfIn PDF document text
    • https://hgb.se/filer/file/41039605559.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6b30319ae1652d964b97799fcbca5502/regikuninawanarineva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=atriplex+plante+m%C3%A9dicinale+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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 10728 bytes
SHA-256: ef18ccbc77c1722157fbbf6d575a7c5a153c2d9fae002394600746df9ec14179
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 22080 bytes
SHA-256: ebd7c2fab82547be44999509c67b1ccaf05384f121d71f2f57b2634337c0aef6
font_02_sfnt_off00013531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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