Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6c17b8c6290fc9…

MALICIOUS

PDF

107.2 KB Created: 2021-07-01 22:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18ac4a063654a2cad788f9fbe1e80591 SHA-1: 93acf736ee0414f49837345bf1c74916552bc600 SHA-256: 0f6c17b8c6290fc9ff6c42248129317901efd69dc1be8bbbdd0047bfe43721da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary purpose appears to be redirecting users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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=things+to+do+in+bridport+dorset PDF link annotation
    • http://ud2-140.com/files/parolekewafibop.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3a6afa07---jupujodirowesalitefir.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3f008823fc37ed217bdb44ec816771c/58429231698.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/br0cimtc2rpfh8gl476hhpu7vl/72162421203.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ue1f69ov211uad4ns5ekl1meh3/talazilekowi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1bf944cdf836408c67e9a67ba01fbe02/vuwojonelogorepajozozun.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fibfaa8dgvka5iem61dfs8vddd/gifezu.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210612_374EC2AEA7DAF9E9.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/29257796861.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/lozalom.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/rixagaxofixeparijerudopot.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h3pl349fsrd8h6t14dvcrrmb41/dovazepixezifunixirebuji.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa45b3cc2---zobunoz.pdfIn PDF document text
    • https://limsurempat.com/contents//files/dowuzuxovexi.pdfIn PDF document text
    • http://kco.su/userfiles/file/63258009682.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bq421a2tdt1tq6ia8rftnvldq3/32174970892.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/eba8f679cbd035a787ba43e6526c01e8/marejiribipisiwefirorav.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607954e9185e6---visufujajinebe.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f84049735b582071a001c420407b695a/vitiguletumu.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/42745103581.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/c0b86317d52e06eaa60989c107a1c740/zelosazudiwapibi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59aed7507---dumotijesetepegizax.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/21451656180.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_off00014235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4C 10564 bytes
SHA-256: 5c9dcfc5c8d06fdd8399441db4cc993279e97ca7329a8824cbe02f1a56413fef
font_02_sfnt_off000171db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171DB 17748 bytes
SHA-256: 4377ee3f1b0603aed90f6f1e684a0441e5264183ad23850015352b0700b37b27

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