Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc2a4f920398262…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 04:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2bc23b7b13349ca8651e21f5af95171 SHA-1: 717871d13d6ab5f2e44735b21cae752a77e673f4 SHA-256: 4dc2a4f9203982620ae69ea265248c67f18bab721232160b9796d803c628739d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a pattern of directing users to further malicious documents, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e512441f88b07f78af605c32ca8bf111/14351920129.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c75eedd5b6---38729862331.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/mojigebezukipokizil.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607301814ed0d---46319096289.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4ae9af57---miraw.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c83b92d7---19103042265.pdfIn PDF document text
    • http://usagimatur.com/files/others/nakerogu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/jiburegametabekagagu.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/73643496062.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ebde19e---watomesiwos.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/55098225801.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/lulozosadukaluvulotorakip.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/gifipiruvokoxuzesowib.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ttcatmgd7lbmssolehvfnukl9s/75892193702.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/vowexikekogovixiki.pdfIn PDF document text
    • https://parkettworld.com/upload/files/xiwakofagumapetajisutop.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/63405763292.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0287b5b8f7---3747155987.pdfIn PDF document text
    • http://wych123.com/upload/files/murewofazufo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a36493aab61---44785039977.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/zadulanigegava.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xemalamakomebasorurexipo.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/tizamejojinotuzegup.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccf395e71---9893446584.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/48616986248.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/52943190094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=adaptive+filters+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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 20048 bytes
SHA-256: f2259a7e3d4349cf335fc1fdca855529eb01eac16a210cf2d4adf1eca465db49
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 10316 bytes
SHA-256: aa363a1aa9401575b5b7e67b3283ceaef110e7e4b5603fbecfcaf9922210b6b5

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