Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5b63c76817831…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 07:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1f5268540e920d7106fb70b2944a2522 SHA-1: 6bbecd91627db4e8e9fd56cca10cdb73db62a3d2 SHA-256: f3b5b63c76817831ba517a8ebaba7adc575ddec4d2a8e8e75bcccb44475b7523
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other domains, likely to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests an attempt to leverage SEO for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://9meclinic.com/ckfinder/userfiles/files/88251631437.pdf In PDF document text
    • https://www.netcorp.hu/data/editorfile/momasoxu.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/xifajikuwawoziferafepo.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/siwawusifirijobu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/ruriposimupek.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/65516100224.pdfIn PDF document text
    • https://basisangka.com/contents/files/28307100587.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/75575525249.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bfikcjmn8isqsbmmoplq93li08/kabegosevilof.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jojowebimunit.pdfIn PDF document text
    • https://heureka-cz.eu/files/zatilelesanetuvemelitari.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b280caa715---tupibiwefikufebor.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/nezip.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/66808652631.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/27313392080.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613022c7ed30e---nejoj.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/60056803667.pdfIn PDF document text
    • https://pellevah.com/upload/files/regotix.pdfIn PDF document text
    • http://vaynhe.com/upload/files/85330576571.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401c1cf09c6---towarebo.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/zunulad.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/sejiw.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/kenogifajigewiga.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/23472376770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=escuchar+radio+auriculares+bluetooth+androidPDF 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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 17028 bytes
SHA-256: 5a4632f8ae1bd2c0e7b47dd7ed347fb2e7d4137776e47d9a770b5e8c15898652
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 10688 bytes
SHA-256: 562ecdc49746f4c3afac01e5c1550105abe20d7808b26f45b604defaf1ce5665

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