Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3483318c76940e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 04:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e19638d9ec920f6272bceeee6aba3b62 SHA-1: e030ad0f41ab1ebba2f7d2ef893f5bf4319ce3d3 SHA-256: 1d3483318c76940e8988dc70ac1105eda28ec6a5e7345becdee3886307a71c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, with many URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e3d4012e---24989885123.pdf In PDF document text
    • https://eniedu.com/data/file/20210819034211.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164063f1f6---gitejutone.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/vewided.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/72300962565.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/loxosenesen.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/99311718115.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b00bb28f---40308944913.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93a653586---38323192004.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a3138b1a8---zofimadotupu.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/8492285950.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/55531088984.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/38936847562.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c91ada980---31825180640.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/79167545270.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb94d3a7f5---93739938392.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/mizebatavomoxosagadoresiw.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/vurakigofikupuwilukozuwob.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/25650489996.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/1143857138.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/nenubig.pdfIn PDF document text
    • https://orangerun.re/photo/files/71689835708.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f72d81c68---61756314834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+pdf+to+jpg+free+windows+7PDF 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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 17100 bytes
SHA-256: 48d386e75b7681f22a099505d49a4e50ee98b419368c56cf3542817a0d035bf4
font_01_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 10828 bytes
SHA-256: 0a8632cba6c1cf440c8359f7cb491e76056e3a9209a7c22d9ad6f00f41f76a44
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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