Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cc928d411ecb9e…

MALICIOUS

PDF

87.4 KB Created: 2021-10-06 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 18d339010b62548e57101187325649d4 SHA-1: f85265c280b01851bb264afb1040156ca6bbc73d SHA-256: b3cc928d411ecb9e9ffede54bf13308e03a3d9e600cfe7bd7090af39e1ea02bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rugerwafers.com/demo/ruger/beta/userfiles/files/21635361893.pdf In PDF document text
    • http://vilocom.net/webroot/img/files/lipagekepenowa.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/83903999038.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/47893446064.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/37517154560.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/55722281890.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/83307770157.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/ferumenojowituzeda.pdfIn PDF document text
    • http://dasbluemchen.com/muwezefin.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109131459094594.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/kedepekafimuno.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rs5fgs1n4b3si3aim68crkbjqb/pokinuweborizebi.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/76830663180.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/7249230346.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/27294740790.pdfIn PDF document text
    • http://castel.lu/userfiles/files/toxiged.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/93248604552.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1b46c7d40aa10f8f4feba489a5a47fe3/sefagamurog.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/bigujarorazodisajajit.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144fee1d3949---linilerilil.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/nejiwe.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/16224676415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=foremost+near+mePDF link annotation
    • 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 10108 bytes
SHA-256: c91109739b7a9c3a778c14723b7ad5f5e33b7f158c01ec3e7677670dc3b214e2
font_01_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 19992 bytes
SHA-256: a2e7ed51518e0563653007f380423b8d75b16b8f6abe62225edbe09abb83ad47
font_02_sfnt_off000138c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1