Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdc14c3789d45f0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 18:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58e784000a207f03908f7b158728bf21 SHA-1: 7c8a6b09ba87cd78fa89cf09e0cd9b960ad5bc80 SHA-256: ffdc14c3789d45f074e24b3b520f28e480a889e3fcbe014fd0940a004ce01801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=android+18+xxx+krillin PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141142fb2c64---94708456208.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/rebosezoremejatotet.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161498e8a99fce---fejerotifofuja.pdfIn PDF document text
    • http://texmet.pl/userimages/file/solep.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/10279769158.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/19357021055.pdfIn PDF document text
    • http://getdol.com/page_data/file/45430695707.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/63710821468.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/wugiloxovikukiduvaboxuzin.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6fdd29027559aeded5652218d2fc49c7/xuxazolibulavazamufa.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142208e05d45---kadovusasiloti.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dixiviliroxi.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308030797421.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78687440783.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/18659063568.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/woderifidex.pdfIn PDF document text
    • http://ergakiland.ru/files/files/58588067478.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109141016382052.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5cbr9if0iqidoira31c7l8pfhm/81749373602.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/medotikelixufis.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/pugepuj.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/88378420042.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dofagobopawanovezurovezek.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/92664074678.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/19753990568.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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 10116 bytes
SHA-256: 9cf13c0d67df88f47c08e44a2070bb63609761b1c223d8ab5b80007671bc9958
font_01_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 18168 bytes
SHA-256: c7e1bc0705f042d41fd167e717648a25e821d2a673df6e09cf6bee37247d5d25
font_02_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1