Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa4b088a1d0aecd…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 13:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd8aced328284d5d6c85e5e618b5110a SHA-1: a035141fe6834f8d3da69a8a0e31f0f7c5896460 SHA-256: bfa4b088a1d0aecd6d7294512fe6372ee5c3ceffb471d00fdc64b30e2a74121b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF link farm heuristics suggests a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://1-sanya.com/blog_images/blog_/file/54451331418.pdf In PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lobaro.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_97094724E4558646.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/mekizoburorumex.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/sowonuxumexogogekefamex.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4653f1948b1d9ee47740e16786c6fb32/zokujiju.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142168f6a01a---bolobaxoboxajubedaw.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wutexip.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/doxasogafagonuzifik.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/16572107403.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090301149703.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebezopiwu.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/bebizesilizom.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/paretuma.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/jikupamavuz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139632a9a2ef---maxopuzuleze.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/85700822082.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zupusarob.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/tudavimapapajiwesodatevon.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/4333956024.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/kofufadeludogigive.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/25151007949.pdfIn PDF document text
    • http://holzweiss.at/zufukemasa.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/fimaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mod+apk+car+racingPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/88583365722.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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 10328 bytes
SHA-256: aa9f85cc7aa1a76beb9299f20d2e345b906678b919d60fdf7b7d9bfb8dceb9c3
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16476 bytes
SHA-256: 5546fc51ca1960c58d4241d1ff9acd8d58b4847bb3499305fb74c73b8d4da25a

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