Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6951d515599a00…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 06:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f98932a19f23c54536f8424fbf8d093c SHA-1: 5169e6f238eaad0a7ce0e78983bea36efae99e11 SHA-256: bd6951d515599a00f25a36ecd8787c057ce30ec9a6d2e1942978639079deaeb1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4p8mn614h19e54nqgkbkcun5c4/wuxozozepimivekinefis.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/14042027789.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/82338315085.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/sazalevif.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/1608639082.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/42837746289.pdfIn PDF document text
    • https://cakkue.com/contents/files/zajefuru.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/29593827613.pdfIn PDF document text
    • http://15881588.com/ckupload/files/9423430926.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/farix.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/zevepan.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613464340330a---gesosoranuwawijudi.pdfIn PDF document text
    • http://ossokahve.com/upload/file/nepujapudesor.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b7fcd8a1---57812128054.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/zidojoxevegulukixojozuke.pdfIn PDF document text
    • http://jar-ted.pl/file/57297506882.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5r1s9905utsbntr73tg43k0g1/kutibimagevixomomarebu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/13333927832.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/wufarujamexo.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/74542075414.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/98339948800.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51942114633.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64e1d5a1---wugiwimudolotituv.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/5847903351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+put+phone+on+do+not+disturb+androidPDF 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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10760 bytes
SHA-256: 424678d8d22283513bc491a1c18e8c69b00fb2fcdd8d009e6fe5284ed7029350
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 17620 bytes
SHA-256: 6b803cf287f5c461ed52b84e5c205cdeaa12aae6ab361f8c1e59606aecdde6d0
font_02_sfnt_off00013181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1