Malicious PDF — malware analysis report

Static analysis result for SHA-256 54472d8cddce828f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 21:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d95d54a31fd02bef424b87be20b93890 SHA-1: 4c51b127c12490bef7a76bedb29fbb8b195306c7 SHA-256: 54472d8cddce828f5d41d6bec72cb7738a589df650c979dd876aafcd5aec2e7b
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to lead users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://electrodomesticaruano.com/images/ckfinder/files/vojowivafelonekize.pdf In PDF document text
    • http://metalltechnik-kutschi.at/bosudiwuxilox.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/visusidotofig.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/pujeximemufekaxok.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/0849e54b652eedcb0bbfee4c6b2bf9c3/78850982087.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210728121905.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b23a4c1b---37936845413.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458c8258e0---jowipizuwufirinere.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/58857698374.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a093113f---1826359485.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd277d1c6---5981741580.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/godumema.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zuvuzaxodutesomodagoli.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91c5da44d0aa61d52046eb4a2a9392da/xuzidukejeto.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb83d9233---97009775468.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e97867b5ece374e7eb33711c5a44b7b2/13843322890.pdfIn PDF document text
    • http://drcleancenter.com/uploads//files/202108111432059748.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/bagonoli.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/bolizanegadopukonedujixum.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8676b059b3---nopovogaja.pdfIn PDF document text
    • https://afayl.com/userfiles/file/92020918941.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/37723062522.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078abad162d0---11479410363.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210816205602.pdfIn PDF document text
    • https://equinox-e.com/upload/files/parutarapoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ice+cream+making+book+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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10832 bytes
SHA-256: 72312b4673afc2f5a5a72c3d3d6442f0e9f26b206241a71d84f51ec37aa96fe9
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 16992 bytes
SHA-256: 307a278c35628b1251dd7af8eafc8aa6ccb691c5789b0ae3dbfcea94f2c8112b

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