Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d22789b532f0f7a…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 16:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4b5e5ac587fb55298a161211d69a47e SHA-1: 91f6f242680dba7dd473a58909bde0119806fef9 SHA-256: 7d22789b532f0f7acff0ce85e378247722181877ef3a48845e5d87de4b8e6796
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=impressora+doro+pdf+download PDF link annotation
    • http://dekoblickfang.de/userfiles/file/55808925703.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffa7a32fd2---jenujesejanokorog.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gr311k4nsq5j2qmug9ihq0081m/68040934267.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bgmlgm80hlbcpv6kdkc63ar395/zafirume.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/58193502821.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59ba0863---nigenupedojaxari.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/mofekozatomadokinoz.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/gutiridapezukuloseluba.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kirumax.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f2a11a28---bikitefupanu.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/noxapipumi.pdfIn PDF document text
    • http://momsystem.ru/public/file/lazanibazamakum.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98734260371.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/59715589499.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d568a535---2721964185.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/pulelumed.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/83604995459.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/46703963237.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/61755898014.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fatixabe.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffae1bc69---degazokezedumalep.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/wonesojiviv.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_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 19784 bytes
SHA-256: 92af79a5196f677ebb77eb32283b77e5218d9b1d4183b32783b0e937f83e0114
font_01_sfnt_off00013946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 10504 bytes
SHA-256: 7034c84cc179d9df60fb99b00805bd940e78bf8f5251050ab9165f6159ec431a
font_02_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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