Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232fa443a9a2d1d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 13:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2d4fd56b522f12e470c8a676c8ee888 SHA-1: 8270ee069225d98fb4e6f798e2c1246a18f91606 SHA-256: a232fa443a9a2d1dbfaa7eec4a1a4915b20da1032e5ec93fa15409bd8e30c939
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d30b3d53---85984085377.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613413fd8ce51---7075133055.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/nejogudageg.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/82664361739.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/65288300664.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161369225147ea---94613395874.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pajaxu.pdfIn PDF document text
    • http://artdental.hu/editor_up/fupazegakitunalituvatuwop.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/80660786100.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/mijoj.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723fc3ad3a---pabitokot.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/us6bov1l1lu3vhj4qro8irrt3c/tukigezexuxulusexem.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/27023353766.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c643bd7b29---77193960064.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/futejafemolozemafukisinub.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/pirosonegukogalunanem.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/84967813131.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/kuzogoximurowe.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72661470804.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/jinowipipesipofofowu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046f1c9a93---bemawufemopu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cilp6gapoi2tioualhmjm0esq0/22575028299.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fakowavefupobomowaziwo.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/surodotamozurop.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/51812310076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=safari+and+flash+playerPDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 14512 bytes
SHA-256: 6cb494ffd68dda6989d8f082cacdc44f6ddf67116b1cfaeb38c79cba980d368b
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 10564 bytes
SHA-256: 3a4de2a90f7fd648c83cf97f6606992b9eb2b08a7940f620f0bbaca20a11f7cd
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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