Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a68e2e1cb3f9b93…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 06:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27b2478ea7165396fed0250174ecf365 SHA-1: 713f71f5f2aa0ccc7139828d51be78fc3ce071fe SHA-256: 8a68e2e1cb3f9b933cf1faff20ca54625ed1f6ce13b5138d4386a6e64597a015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to compromised WordPress upload storage. While no scripts were explicitly extracted, the nature of the heuristics and the numerous URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alnadaoil.com/userfiles/file/48577932932.pdf In PDF document text
    • http://msinziniering.com/userfiles/file/guzobolivaluveni.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/21242832987.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/2797476252.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610305be98074---17063470773.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/da6fa51c1108acd24d2af4e33c91a3ea/mapujosafitu.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/30810521465.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210703_C18A725AE048103B.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/nowifalosaja.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4c1ada6a34dffc95680ca59e68a0e582/bukuxasimefakiteviwir.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/zakokazelutafav.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/961427b28e7a1438f16ca239909bca14/80732269041.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cb41d5e1c0915f6fc2eda82a1d19f0c5/98183246768.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce97ab894---judaxabofedavutibozuput.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe899b53d1---48718494748.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/surafovufeliwipiji.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df9f3a98858160dfcd79ff864ae0b888/66056472125.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/wewexagasiriderawupevazev.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f9daf869---66534282349.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/55059255032.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/xapuzorisoni.pdfIn PDF document text
    • https://termoformat.md/img/files/biderekelixos.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/av0ll7jlesip7ff56fdm7fh77h/wugonupavavimakile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+carbs+and+calories+in+deep+eddy+lemon+vodkaPDF 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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 11068 bytes
SHA-256: 97df6a654f71f82b479ca27f4e0dd15c91d5db67fcef89882cbc5434244f25ee
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 18488 bytes
SHA-256: 41d7ba9f44c6cfbb31873ac357f3fde0c4a0545a6ee43ecf7f96d4cd566b4293
font_02_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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