Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dba0ea8cda3e89…

MALICIOUS

PDF

109.1 KB Created: 2021-08-03 03:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98c0c3dbe47f94c694424199de94c667 SHA-1: 8603cf1dc054fc60d2f76c80f8c60e71b22369a8 SHA-256: 97dba0ea8cda3e89c652a433ece6e58b4d9bcd83d125ef5bc482d867561f54cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several heuristics indicating they point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to a malicious second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ferado.vn/userfiles/file/96197516250.pdf In PDF document text
    • https://mmszke.hu/files/file/45622666831.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/14380171849.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xebawilinuvegivavuzij.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6c7ad7bdafca077bf579310e09110e78/zamifipinaxixiluna.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/22482059793.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ed68e4ef---72201711835.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bb183003---90657143138.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/magijonujaboxiw.pdfIn PDF document text
    • http://aven.su/userfiles/file/12820940003.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf2658cd0---pudefasuro.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2urq8isqbv8rve45b3l7f3af1i/tijomopu.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/tififilinad.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/8972521422.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88cfcdd8e8a991df190f12a9fec4a2d8/48122290974.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/990tvh2g5p2r00va7b16bhgg91/81649286566.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qfjiqa6bmm243fq855df4nbtho/85638077078.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/7229471409.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2c8f0311a7f065e6ba9c74fc4e5bfb2f/tajedebukisodebede.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4b43953aeb6dec6c340aa7e7d8235151/79076788716.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/aa61reg0bdns94nsvmruf956km/79195323458.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d782a9548---dafopesiwepur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=resumen+de+los+4+evangelios+del+nuevo+testamentoPDF 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_off00014368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14368 18836 bytes
SHA-256: 94761e884a597d322c57d303d12b98f9125ac2ac6666c72f6cf64042f5def485
font_01_sfnt_off00017308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17308 10780 bytes
SHA-256: f3cb1964d3c147dc3b6963b25886c91c0283e3d16376d86a25f256e22dd58277
font_02_sfnt_off00018bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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