Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36499da3a47ce72…

MALICIOUS

PDF

117.5 KB Created: 2021-07-01 10:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: baf18bff7b0c54d106ec8ba7a4884d74 SHA-1: d74055730ea26825fe298a7577f5bf22f647ead6 SHA-256: d36499da3a47ce72139b342c2fe90496c41c73d9d115b901b79e01d35de66e86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://caribemed.com/userfiles/file/kofoponojiwadoborosodefos.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6cd02d605d648eb391686fbfeddbd1a5/nuxewewinipefasese.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/95bcd4574dd20a936fb267767469fe2b/dufud.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a4553690503bebb1c66af6e3490debc5/lepavupifa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713dcd6ad29---28116336642.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfa6250c4---wamugojaf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6573e7b3808557cb4bb06f718b41b406/41800449746.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/33559968694.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kawineroru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a2a1dcd5---87624463715.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04cb50b80---47441366674.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dqfg65e8ik8g6gh5bnn5f78ot6/jamajif.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167fda3316---naxofu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c85bcbf6f---vedilepafome.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/pefitokevujelowunawaluda.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb52eef80---wefezinigajedopaxevozexu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/69196f7c6a04e129565d1a9d21906ab6/17209174112.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216975488158.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6416a9569b8b50a72652fcd00b1834e/90755813994.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/90933899812.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/mijuvedusezovobefedemuvu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83c91ef0e---gabaledituvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=catch+up+laterPDF 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_off00016ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB1 10120 bytes
SHA-256: 5a3b899f5132c5c65e42b2f772cf1ccf5be58dbd5556a5fcd34aeb2df19fb1a3
font_01_sfnt_off0001817a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1817A 18040 bytes
SHA-256: 715d79dce85cabeba36183f219d9c6b4d72dd438c945a9394ca5745d9c80080d
font_02_sfnt_off0001b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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