Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd9e93646351011…

MALICIOUS

PDF

90.5 KB Created: 2021-08-15 18:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dbc256f82174e6710df3490424022dc SHA-1: 4de2fd04330b1be897f901fa99e2df745dfde9be SHA-256: 4bd9e93646351011c4962079c18ab337f238ba764744b93b21ca66afab137610
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute malicious code or further redirect the user, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ecvh73iogm10nqvqe30aomb5f6/kajaropa.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df18654e0d---dudilozujukuvijun.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/60925927927.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/42942966477.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/mujowudanegolajuvepibumu.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/nopavuniwurajomigapam.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/nidupeboxu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79f4db208c---27050495084.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/43377376279.pdfIn PDF document text
    • http://nensi.si/upload/file/14387264588.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/xufugabekufive.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fd8534f20412830443fc25b79a5af26/9353040146.pdfIn PDF document text
    • http://oodow.cn/upload/file/210617011238885493o1gfp5mb6n4d.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/tuzasadajiwir.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/444547fe4e7f8186012a5f1239cb1ffd/lusewigimafukewu.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/furalodubefera.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/fezeragosi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/606339de4c634d8f8cb2ceb91f5e9d3e/62061922324.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/51627894998.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/92363776278.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/85404579545.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/25452138937.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/vorafuxukalegobovurudozo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6ade03679---gazetuwovenopu.pdfIn PDF document text
    • http://kccmaul.com/files/files/talodewip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=t%C3%BCbitak+1002+proje+%C3%B6rnekleri+2019PDF 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_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 18980 bytes
SHA-256: 93a7af22f5b3beb4a17dc5681220bb884d7bf9d1cfa62c47944594b70248122d
font_01_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 11268 bytes
SHA-256: a9f35e90078500348cf478fe1ba02d24d9f18f96c977df0d0b5a5e7af392e1f6
font_02_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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