Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f73dfd554b2296…

MALICIOUS

PDF

74.9 KB Created: 2021-06-18 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 234ecf8cedcc65eb4a2762d73a6eb53e SHA-1: d743b1cbcabe39e669bb306eb5b946e90209a1aa SHA-256: f6f73dfd554b2296395dfde27a45d035a62e128d90519223111e0f2223719c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

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://oniceh.ru/uplcv?utm_term=potential+and+kinetic+energy+worksheet+4th+grade PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f08b14a1f---dulafobekixawizabib.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4da63108---79969329188.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/os917hn4m8oar5suuot5augegk/xurer.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b23f4c812---kupadawodilojoregaz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/129b743ab231a89a2315db273b45b8d5/91603261636.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/gejizemedomamolepaziri.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ef50d4e7---70508002647.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/63091a6ecff92ac3c5d78ae8fdf07c23/99388290136.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0276d8e43da39aaddf9252c8dbfedbc4/1892666942.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/274fcf5db07d8bbc4ebac031fd0289c2/rowol.pdfIn PDF document text
    • http://e-hane.com/files/xexoditu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c239c41be1---68479600576.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/fojaviludatabeke.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd3e76262---mazozizanilesule.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/44rrto7je0n505m22oe73uvtul/20879974047.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/pavuzexenojuginugodupukes.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/gikunokofatigesan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 5548 bytes
SHA-256: 0748b46404510774d02e67f0b6c0e0ee6adc8a815d4dcc81a49522ae809badc1
font_01_sfnt_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 2536 bytes
SHA-256: 6e2057e8ec73eca5b0bdde74775db80f5f8f499a330daebc0a2af7001bf6367e
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10860 bytes
SHA-256: b81d522d9f08e99361c3f58c07ebb864149e5be4f870519ad345eb44d2ed7024