Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f20fcb8d740ca3…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 18:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a61ddc2948650614d19365bf6a88441 SHA-1: 9d46d7e8ae4ac2a468976ea4ccefd896f4b3dcfc SHA-256: a8f20fcb8d740ca3792c53138d1a3bb47f1510e4d0d6b70840e95d225ceab760
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions, such as redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://inwebjor.ru/uplcv?utm_term=yadda+ake+wankan+janaba+pdf PDF link annotation
    • http://boston.pl/fck_pliki/file/fifunomaleloxodagodedof.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4675ccb1---21651961468.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4e4b5dee---vodunobiravubax.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2ca70bb29f9c8d68631f8b03875b1af2/vogavuvojelapuvum.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/98189201772.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5141764608.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/9766852691.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/32656041083.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34309db8bb---26113475095.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/71675257324.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/49306108250.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/fizimawikaxetap.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7efc9697---lefaweliw.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kazitinafa.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/xorisoduwab.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609efaf963910---kojuvokulotovudos.pdfIn PDF document text
    • https://parkettworld.com/upload/files/98921331463.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/moguginazanesijukuw.pdfIn PDF document text
    • http://mega.kz/media/upload/files/noralukibiza.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/76736054766.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6177b99a24---50568077948.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/jaliwibotepod.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/32174461833.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/2128663672.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10296 bytes
SHA-256: 6fb311bfc08e7ee71f495192253d9171716818279f8107191cd52f61ee6e9216
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 24940 bytes
SHA-256: 32f44139ed86d1144fd2f255e4e5914d40cfee17e820b61a7db98a3a0395d7ac

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