Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62f8b71c6a4519e…

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 01:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b57285288a0764aec4b85e73eef52ec SHA-1: 1672917321f8579d942bba97b0b27751d5f5571a SHA-256: a62f8b71c6a4519e175a201088e9db3af00871e3b22a65fa0352f1a8a44ad79e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised websites, indicating a link farm designed to redirect users to malicious content. The primary purpose appears to be facilitating access to further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16095b1357b64d---tobuxakanaf.pdf In PDF document text
    • http://ccswcd.com/userfiles/file/pivonipovusasufidinuwoza.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/ligolupusewerafavam.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2d133cde8af3db45601423449e79d64c/mupizupidawegikajesasowo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/nt81d0nbi24296etvsjbdm5vaq/gamasijazebowuwoj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a29848b63cfd934a7c298b30ff0adc57/xotubip.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/aa6bgrf4quvon73b4vebsq5lkb/vidajun.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/40195235234.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e81211aba---romoguret.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/26479898159.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pifisefabuwu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/71398142204.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785fb02c452---labasumurifaz.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d52b1b905e---10334594463.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/buwem.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/69385a370906cba793250fc92974c122/ribovoroxijo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sisupiludawuwutoro.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9c7db391fc4b1e115b71bea009b438c6/7086963487.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6f1rf99cha82j12f1ei36k2s3m/62527751507.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lnf6ridtpkpbsh9cph1jiaq6im/novowirupuzikidane.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/batazira.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/5362124724.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lobakejuraditumesa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/19882df91257d1e35602f58cbbf34f83/65463282904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=king+castle+chessPDF 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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16820 bytes
SHA-256: 930876af246831686bc3f8287aa3df432490f6560ccb23828b8508a0728dba4c
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10280 bytes
SHA-256: 9e8f2c037ca3a9561d8992688a782c29267e8a838a7a54f3e3213b7adb896e4a
font_02_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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