Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4a1bba90dde9e6…

MALICIOUS

PDF

90.5 KB Created: 2021-08-07 16:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5929556a46e37405b6a7ce478d6baed6 SHA-1: bd93595486ce4e99565cd0105298d5f87ccd906c SHA-256: ef4a1bba90dde9e6a70083e66bbaa1716f5263b3d70bcd08698b82a0c3696725
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. The file's structure and content indicate it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=camera+shutter+count+canon+eos+1100d PDF link annotation
    • https://angkortaxiservice.com/userfiles/file/21660356092.pdfIn PDF document text
    • https://area5srl.it/file/20438793884.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/58789536958.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jogabunagipazovawi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xiximenitifamat.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607499fa75ab9---lozotuxasamugipagavowu.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/11419516020.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ff6fad0544fefc96469af917f2a9669a/76449354724.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab6892bff9---69832929324.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/11111838351.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1f9337e1---rewokuredu.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b17ed6055d5e39ca57615e210c97c67a/57979443753.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/50d9350a892c05d3b34bb0de58b4f8e6/12193653674.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jubede.pdfIn PDF document text
    • http://360global.ca/userfiles/file/82774633926.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe8a6efcc---82965670662.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef765c25ed---92941032023.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/46551329621.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/60901972325.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccaedb6fb---lotorowasanasozese.pdfIn PDF document text
    • https://europartner2.pl/uploads/luwuvunivezefosabukovo.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10800 bytes
SHA-256: 16ce6ae0286ddf5905bcd7fc66459fd63d1e0c2c844994d64d440988abfe2595
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 18668 bytes
SHA-256: e9f1b5f3e67c1245d8764cba9e589a0e18d8931579e2c318dcfc25519511f914

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