Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff27d16f59f175…

MALICIOUS

PDF

95.1 KB Created: 2021-07-19 02:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b10c99978cb9f3350a3fb759e21d6c93 SHA-1: 7d27f20171d3e6f193d9b7099444f00c356fc855 SHA-256: ceff27d16f59f175dd5cc5d3333c03f4d6b211a5cedc549f05a6bb2cf50b0a09
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alliusie.com/userfiles/file/11812349900.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35af6f01c---guxugezadilivon.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3nvibo2tggifa64vjvm7457c63/fuxer.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/fivosisefan.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/4504530588.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5f501e30df29be532e86060d5c8a3560/dedenolurak.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bo2rss08jf8irecfghm57crnc0/vimefeleranosutovumovoj.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609231ea3b6bc---786757580.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pibumebanibom.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/85420960771.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/pidubatubimimatedak.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/mesebizopirisegejotanadu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210719042052_j2bffz.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/93095d2a7eaef2e94013a255e7e3d9ad/wanosoporukexazet.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/76078108971.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1geq3c4v85p0gt9rb1etq99je4/37294287727.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7501fe6d54---vizofobagomuwozupisetam.pdfIn PDF document text
    • http://dnepropress.net/files/file/47677967162.pdfIn PDF document text
    • http://planbmedia.hu/files/54220132820.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/31700026186.pdfIn PDF document text
    • http://3sdent.com/upload/files/kipofagosefasos.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc0f50272---7636235795.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f789ac4495---22239615947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+skins+among+us+iphonePDF 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_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 17532 bytes
SHA-256: 42f62321f2995047ce3cad9fea672215b989aa06d3550b755d0ef61dc1b58341
font_02_sfnt_off000156b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B8 10724 bytes
SHA-256: 0972f60b6204422b4224e839ac8920991febfa212920430d5a913469801a16e5

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