Malicious PDF — malware analysis report

Static analysis result for SHA-256 211c09de97fa6434…

MALICIOUS

PDF

77.6 KB Created: 2021-07-15 20:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 021ef229d2207d8d972067c85555d421 SHA-1: d34577e84dd3c0b2c8cb830148051f3fafe6d7d0 SHA-256: 211c09de97fa6434d115618f017e7b27ae8152f9fb02430fdc8bad060772c233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=density+function+example PDF link annotation
    • https://pypconsultores.mx/userfiles/file/7133290880.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/pomigofedoborusu.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/42953372540.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/74dc887203dc4413403d0804a08c49d2/41991664272.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7cgrhjdkcvb5d7npmkjkg85voh/32182989503.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/73624528536.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4da7d90f850f28b93398b7602b3b40bf/wituro.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/revuk.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bfeb9d7dc---11954394467.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce32672570c---jafixevojodesako.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/39893900694.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/fumujejuvozas.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d56370b8a99---70428283221.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a7304cac---nelenifiramopuloduviviv.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/25530750880.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/075e2fb2055ea52d2a62e0f62bbefb97/rijepowukeguzijas.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82a7cdd95cb8ab33a933ccb7ba06c3d/49293355106.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/67009610635.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e38de63745f1e5e633a58aba192d3a0f/zanopegenibufatuziw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/620a5467c8e1b0aba8dafab9b72129f2/76294557360.pdfIn PDF document text
    • http://nfc.soo.jp/file/fuxarakowigolo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xovalozewezosi.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35eef5bf23839d80c16381ef4c87fee6/taralikejufave.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/71653611902.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b8b608c4---34530466701.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcaf4a7588---mitetegiz.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/kugudisibepujobunewiw.pdfIn PDF document text
    • 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_off0000cbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE6 10860 bytes
SHA-256: 8a3779b02c81b3cc785ce815add235e47c9ba89cb32492c47c7278cc6c35ce44
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 16292 bytes
SHA-256: b36b2f3f34d72525b013fbf9746feb069c5b33012667f2ac23076a7a9ddf572c
font_02_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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