Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fdd54fbea26582…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 06:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f33377fcb781997d2aa2afd12aeb79d0 SHA-1: cfaebb28e9b6c98bed2d23500650c5660802c416 SHA-256: a1fdd54fbea26582cf77f39619cc5006abdfa8a21668dfe681d77461fb873ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, several of which appear to be compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is designed to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301072dcccb---88079060170.pdf In PDF document text
    • http://ancient-theater.gr/media/file/vevab.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/xapigesoburatoxi.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fe0fe82bbf5877f9acde1aaa4f2e0787/sorifafomitimunilatemarum.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/54770954805.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/54804191321.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/80384969749.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/nesejirajixo.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bubuxafu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db14840cf---34240222231.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/32355611324.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/mavuxitediwosotinufuv.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/64945599217.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/64598691805.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed360e0886---vabonuvonu.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/mugitizitilewefuluviforig.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/99017588756.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/rorarinonapuxup.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/97055262679.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/13511419171.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • http://wuchem.com/upload/files/28160348247.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/50207700668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=elizabeth+costello+pdfPDF 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_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 10696 bytes
SHA-256: 0e78dd531f2eee90d4a165e7068e836895c14139b35c2d777fa468d9037c36af
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 18748 bytes
SHA-256: fb6fd2f9ed8cf6386c1f117ba75ca35b5ff9a25bf1a62de243cc299a5f070ad3
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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