Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f66b0d21ee8646…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 08:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db1eefba89ea8929f0bd88e6df82ab5a SHA-1: 6afffabebdb9a0b16657dc2e21e6a3b24e14e103 SHA-256: e2f66b0d21ee8646275c40f97926c2909b9bf1fcff1f0902d69cb9bb28a029ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple PDF files hosted on compromised CMS upload directories and disposable hosting. While no scripts were directly extracted, the nature of the links suggests a potential for further malicious content delivery or redirection, possibly involving JavaScript exploits within the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dywin.com/uploadfile/files/68801818968.pdf In PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/90744419086.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/54296965359.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/woxulajovoferaped.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7acdba01b---nijapolufa.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/94707790957.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bb4064313ac16c0d4f03b86037fa1a09/42004183020.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/66989932675.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/goponozumuwijarog.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/wosasifuxixotawovilakilib.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vopanusimojudaxozidojunaw.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba19718703---65226553971.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/vabilopirugikexoxebemowat.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcd779b0f---19611989867.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/12586918877.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/23471766066.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101848066947.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194c9bef21---88115674287.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/89568832882.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/dedore.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/rakunowe.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134063c7f209---pukusebumupup.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/26191010130.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/watebuxopesagajedolatajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2020+tamil+movies+watch+onlinePDF 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_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 17820 bytes
SHA-256: eba8e53b41d561cb40f814ea0dacba0cf20e598892a4307cbbe1c2f003b507f3
font_01_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 10692 bytes
SHA-256: 99c40ea831d3232902dbed55db73a724b7d6f870cfe538d996680009f9e958a4
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1