Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc9ee7573db853f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 15:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fb371600d8e058fd8c776451222b53b SHA-1: 32c7b820054dd786ac9a48868ecda0989b19285e SHA-256: dcc9ee7573db853f0b6a8a8bd0ac0d4562fe00c9fcf3eb226cb5e415a570d7d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/38141164442.pdf In PDF document text
    • http://samuiluxurytravel.com/Uploads/file/82822905718.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2lo4vilc2f21b2a9vfa2dlqq6d/xatamogisovubifaz.pdfIn PDF document text
    • http://ned.ru/uploads/files/33443186565.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/xovematemegabone.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e9ff41f4---gomon.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/70884000164.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/45025842585.pdfIn PDF document text
    • https://anjingliar.com/contents/files/topedu.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/jefabiwuna.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/30993581753.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nenotuta.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/98736066233.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259325e1d4---26270909602.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/90948768768.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210915_85050A6AA23F52A9.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xiloridenovuta.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/sitilekaxubinejele.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/59584862378.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hbq80l03cqpoc26uhgdegkjf0m/wemipusadujumafovadi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2335c0a759da9bcdfa45ce55caa41ea9/jatatabarujelewerirob.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/soposarugidilinepiwenu.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/85084978916.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kijenebekapebosifojabolax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brain+out+game+free+onlinePDF 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_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 10540 bytes
SHA-256: a78893c3e060abe48389a71b01788bef4f0038dd51bbe1b463597bd029aaca29
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17392 bytes
SHA-256: c65aa01af366738b640f79a973670614f836f1d56cf94f1cdb274cc0167ee928
font_02_sfnt_off00012619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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