Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf0b5d08a5def1d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 16:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d27c3e79b3552a336a6858b2466cb585 SHA-1: 5e0d0de073ee9ee4acbf6c0d9289914e7a92863f SHA-256: 2cf0b5d08a5def1d306c1c012bf22db9cf8ab2ff39989dff048a993e5bc084e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7ondns3i6l18mmrk49jjjg9vhg/xulatorivimonija.pdf In PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zorikagexefajefa.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e2de763f---zileruwen.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/82e8151ea3d92ac2ec0f50a9c90ae707/60314617721.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/61893803544.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/14444436073.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/jadusagazos.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/3639585884.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/bineget.pdfIn PDF document text
    • http://baove24h.org/upload/files/nisel.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/23761433728.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/luturumevefib.pdfIn PDF document text
    • http://africareview.in/userfiles/file/fovipotuzubisorodima.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/41543401141.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160976675245a9---26813635122.pdfIn PDF document text
    • https://fishuntpesca.it/file/10031659911.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091967ec7c17---96767315106.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tuposezibadelejorikem.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/652bbe0a913ccf8eabaa33170194e728/57582195735.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0c85851b61e7c6d733e5dcd715d6458a/96037694159.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ef790ec57958d5926a9dc331cf43ce3c/85858674526.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/87587920497.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/25310724605.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612440d78d526---9615733145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=corporeidad+definicion+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_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 20684 bytes
SHA-256: e36c5160bac05b52cf3dc42b26fff1988a452124062d4baedc6cd6ea06ed0152
font_02_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 10332 bytes
SHA-256: 3d075c458db867fd49c88d342bc54352d93a55165b0fa9da3987040bd98c6a6a

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