Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3e4d77d52db393…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 04:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93fa5e83c9b036de38eb65305977f12f SHA-1: 3eac5dd63e0ea15cca10fafa71e085370a0192ce SHA-256: 5f3e4d77d52db3930d86c2603853e818acf98e4a377f4bc162586cf00c2e12b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://feng-shuiworld.com/userfiles/file/fopasep.pdf In PDF document text
    • http://makinsushi.com/uploads/files/3560335457.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/5323684593fa72345363c913b1a18cf7/wiworetemifosojofolapaboj.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/44484513850.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/668a44c00394ab88adc43aa4780d10b8/65110431144.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bepusedexevobivite.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/10115067112.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/kokad.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/25j2h5pnm6em9bj1g704is2th5/dikerexowosoj.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc71689cb7f---23992577333.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72208361b---45730087893.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161083b696815c---53776321072.pdfIn PDF document text
    • http://fitviewer.biz/files/file/bilopefiwixunu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/tuvufujutufagemopimen.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/dulinexupuvopitizozoj.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vuxedaxokober.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zukukanakuwujowegesov.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/gujoxotuziguvizozon.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/9565737416.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831c12685e2---79839683035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=c%C3%B3digo+civil+angolano+atualizado+em+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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 11092 bytes
SHA-256: af1930af76dedf506995897ae1a0e44db13f822549901f080b922d5e3c5af06d
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 19412 bytes
SHA-256: e6c12df4cd7d6911e5fbfcde629e7dd151879e073802ad832f2b19dfbb1e201a