Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a7127dd122c257…

MALICIOUS

PDF

86.5 KB Created: 2021-08-03 21:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c5bc239d1061ef8ac09c0218bc583b5 SHA-1: 85a5eb20a6d5790a5474dc147d4a9947b324b4f5 SHA-256: 38a7127dd122c257bbaf0af98643d50228b024ab095e68c8f33ca9e80fb8e373
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ahlhy.com/uploads/file/271444207637.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qocdq0lmtbig62i0i2bhjbuj24/dureditidemududatuj.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/80304383492.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ea609c5---janomel.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf204b74a---gizezafabir.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2a27e90af04ddc21e2f34ca84751dc39/2359138853.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/67239818060.pdfIn PDF document text
    • https://cis.ncu.edu.tw/document/files/27149587585.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/40489566888.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q3cacltvtlfkej4cuhejdsmu47/rojifa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160783a2b6071c---76834150561.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288c776791---tafawakenuwuzibakaxuje.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/83532136678.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0440eb537dce91b9a53cc495b5e6b93a/vawidofidupuzujipufegurab.pdfIn PDF document text
    • http://mamam.by/upload/File/file/mixewovemiduporerinikiwam.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/99504158413.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/277eaf1db67a0be920f16daf33228db6/kofogewufuguves.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/riwefilewutorekizafusekud.pdfIn PDF document text
    • http://skncn.com/u/files/ronevajumapewavut.pdfIn PDF document text
    • http://www.bash.cl/media/file/supubimopom.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e20ceea6258c52e228b278b75404f0d/maxidabofoviwajovif.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/darum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ee+nagaraniki+emaindi+movie+online+watch+movierulzPDF 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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 11036 bytes
SHA-256: ffdaf9b7de026f6700154040a3a78e2fdb5850332a90e704652d77f128f96be9
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17060 bytes
SHA-256: cb9fc496f9c8ef829a6531456c95020d0aa1ce2c22d8680c7d87ae66d89b430b
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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