Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ff242c3db8b9fe…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 08:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6bd6e752341aaab2b7ee5c735c6915d SHA-1: b333da016570dcb04f3e9942d300b568c5379c17 SHA-256: f9ff242c3db8b9fee43d881a43639918f440a85d7cd4cd6d663f549084784167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=logiciel+pour+convertir+un+pdf+en+jpeg PDF link annotation
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6oeqts2lvtqv0fmv9eg30orpm5/nuvixiruxevimetuxefapil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5dt1hd9h2m90kl18apou8389d4/fetenaxijokobi.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/zorejejeguxajezaru.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/gororev.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160988d30d6df3---bamigebadidewibukib.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/radepifibinekeluzenuf.pdfIn PDF document text
    • https://mollis.rs//files/gesosarisevalaju.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/1004439112.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/xefatapugajunu.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/bazitos.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kawajelabujo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210617030038.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbd0c8538---jodaxow.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/83782350515.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9353a7e17---kewuvajoxotedotivix.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/77151456366.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/xokaze.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/63920585322.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6ad67451f0dec6a3f4eac41aa8661c17/vumimisogirotazovabed.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/30ac3e28db77bc79a30ac8f5d317dc3d/23771700937.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/vikaxowivafobefepexow.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4fa16249---89936177932.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/72482410010.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/81991351761.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/70692266443.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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 19432 bytes
SHA-256: 5af9508517649ea6f2d25048f9dd3b8cfc69c09ed157015b0ddea314150a7949
font_02_sfnt_off00013010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 10720 bytes
SHA-256: 3cbba86d4d0a68990f4ecd84173df4683ce3f22b1bc276fdef42d24e93cab600

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