Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39dd949d01a49cb…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 00:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e44a0b01f01599552a204ee6fdbcdad2 SHA-1: 8fa90635d68412750168fab65898853f21aa4b6f SHA-256: f39dd949d01a49cbb8d71a849651c2a7090c6dc4bff4c986a58634fc8041ca0f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, with several heuristics indicating a link farm hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://viethanit.vn/hinhanh/file/pavirekigude.pdf In PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/busezigari.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/saraludoz.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/79778153884.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/79421979702.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d7872c58---55751186672.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/dimarujizikemaganadobaw.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nerofenipuzimubu.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/95483271811.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/tinusezozar.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/66802574129.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/92903851520.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ef4828e32---zetulojo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6133b1d5657f0.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/36386365630.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/mamodisija.pdfIn PDF document text
    • https://citytrafik.nu/images/file/naxuzo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c632b6d2d728dc2b396694dace097674/joxixuzifa.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/bizoxeratime.pdfIn PDF document text
    • http://chemsdano.com/upload/files/gupufos.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/wujuxoferazelesaxe.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51183839129.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bexagagiravowovovu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/85897985292.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/56789193468.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b42d8f5c---47024373264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=just+say+hi+apkPDF 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_off0000b5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B9 10144 bytes
SHA-256: 9e2a57c8c5938b25148e8a087126aa411f7749711f1c1da7c6c0dc20a42d7b5f
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 15724 bytes
SHA-256: 64d3817f18d5cc3dbadff9c79508eda4ad7b7d195e6381e5451d83be4d0e15a5
font_02_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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