Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1ef69ad076cc82…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 04:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d013459f55012344ebf026c896c9578 SHA-1: 48903fd6d2b670c698cde37f37a1b490d6ff864b SHA-256: 2c1ef69ad076cc82566548a8e258a2e5692772f577b4898d891d5a3eee177571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=email+resume+to+company PDF link annotation
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/1449705980.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/zipivopeketapuvivutag.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///doniruxe.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/geledekijuwaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614226a913d28---50627369507.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/womuxogivunugufixidarep.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/zapuxem.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/3146488971.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/28292278455.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/60576179078.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/66864363115.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3b4b01f1c4dd8b92f54b5c6fdbc86ac1/buwolemivimarelazug.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021092320453673499.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134085ab6b07---wobamaminage.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/salowapivokiwajiroji.pdfIn PDF document text
    • http://dongphat.net/upload/files/misomukanerorixanixek.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfadc6929a---22201627303.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/jonumojokajo.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/xetolijazumupumebon.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fenuzopi.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/rajabazojepif.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/50177710223.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/vonivafefikutupixel.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/lisitujejofofefoxoran.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2da1549d---20284507839.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xotutigakipisojalifi.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_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 16840 bytes
SHA-256: a44c9dd90e21c71757bbb023ca78e6cc9d4758f7dab1d7638b7aee7600a07704
font_01_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10732 bytes
SHA-256: d2d8fe95417f99e35ba9cfefbee1388bc5afaabb40c1ffb74fd0b3378fd81d91
font_02_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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