Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0efebf03cf6eb80…

MALICIOUS

PDF

86.6 KB Created: 2021-06-15 21:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 945ee4bc23c0ff27643b540cdcd6c84b SHA-1: 5b433fcb6afd7e8a66f788cb439786ed2a55dafb SHA-256: a0efebf03cf6eb80372cd201130e73d5ca618ccc2876828511fbca736a78e569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://oniceh.ru/uplcv?utm_term=class+10+maths+chapter+13+exercise+13.3+question+1 PDF link annotation
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3550cf901feb64a2a1fc7e9dab1ebc2b/bosam.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/152d9387f36d263d83ac1ea29557d62d/duzomozaj.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061401005770554.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/5081129720.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/41923056515.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/muv6aio4cbisi034s89ob1s6h1/62959687225.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ca80af6f---vodofaxetinavagate.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0e47e98a---8098654413.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/310b81a61bbc6dab1f861076b3039548/69318215483.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/geladubu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f0611091---nuziwuvegogipoz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0djsscdppq25p88ijr4qjjjlkc/1493644480.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/losobabiwowesuvakam.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22e044a23---pesifudap.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff0424365---55848441974.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f9dov1m5rrr7sa4fvndhev6iq7/96474834956.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/6317f8207a9df63d24df65d3a9b128e4/xosalefagutuxov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5660 bytes
SHA-256: 5ba2c357048c2dd79b678381c38361150e59a1b709310a649f33facc72f30e0f
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 11272 bytes
SHA-256: 6e51bf8724adf3079aa8b3be4a79270f8757fd751acc9cd26bdd2b3da560e1cc
font_02_sfnt_off00012959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12959 16088 bytes
SHA-256: 7b61b80ad9eae8da687db589656cc14036b78b470666db3a00a61726a6371a4d
font_03_sfnt_off00013e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.