Malicious PDF — malware analysis report

Static analysis result for SHA-256 822593096b660fc4…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 14:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67bda985e1355211868d8c12a166d480 SHA-1: cff6a4c6fa671065b19b171f9bd3ee7a8b96ac25 SHA-256: 822593096b660fc4e9840b7ee17e6a0b612d4c8b1640b686dd835edcd11e969b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised websites hosted on disposable domains or CMS upload directories. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download or redirection to malicious content, likely through embedded JavaScript or exploit chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shiokuda1.com/contents//files/rapuputisonu.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d079dbb29b---vusabapexejuwutiwa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c003a5f5---30288737125.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/m24ln6lk75vioqq8c2dbhde8g5/luxuxezajiwefezal.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/74902890962.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad5edb64a44a6ff6ca2e0c8e2238d5f7/89005502046.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/forinexowijituninixawit.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/69545069613.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/11346195297.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tvkl2920d2tfmhaq5b19kf6lra/givoxeminamuk.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8mmr8b6vsmdipbefug1pkck6l2/rinopomijenobejokezimopa.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/limunuwiludapabo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5d1dd9c---zimuxujajolomukitota.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/cltraubjm6jkmtkuteg5k2c72e/8770094970.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080edb8d7cf0---40878813361.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qb8not1d578kt9l4btrtgc6a09/doxipam.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dekeleseg.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/sebavodedotabiraji.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1e237692790b3ea05a8b28b9b263466a/ribakoluf.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/430d507c2ca90852d47554907b85b9ac/wosunexolamoxadagij.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/45585204521.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607607fd23e92---zokaxupagenenizuwinujow.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/6308589551.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2e206a86---zikizadebuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=atividades+de+alfabetiza%C3%A7%C3%A3o+para+eja+pdfPDF 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_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 11228 bytes
SHA-256: 685b01ae62f9e91e64ea9a5a093fe6a4ab2a48feb99d516c3fbb9a06ec91b969
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 19884 bytes
SHA-256: 4a876e08e72a9e20bd29e8146298eeb7cb7f1890699228b0cf8e4a93cc7d6054
font_02_sfnt_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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