Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8eb1b9086f1f17b…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 12:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2ee5149c1123f7d8a05d6fc9f34d841 SHA-1: 29c54de7f5be0ae7387c7edd5c83d2d6a8c04552 SHA-256: e8eb1b9086f1f17b0487a82bf5eda37c6e2e60386e8cfb2c1538665e16df3350
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. The file's structure and link farm nature suggest it's designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://stalmost.pl/userfiles/file/xivelevokoxofi.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/611a8261d71a3ca8c2e11f4e8b6e297e/9948519815.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/ramapafuxu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/knb00pto690fuacbmacoek821b/50982948031.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b9094e41674e3a059e1eead393718105/wutakikiz.pdfIn PDF document text
    • http://mega.kz/media/upload/files/85284016414.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/fesuvudujubopuki.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/rofebobonerivamota.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/68506801720.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7d83e1ee---daluribofiwup.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wulexepafonebumumelojuni.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9f3cb574d9269b36df850ae676b3db59/94388681069.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d584ed4---rebukusexevevovakegejapat.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b115b881788---75825070177.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/avdc6li2rh6aqrulbr7bot86ib/tesowuzewuxusajegigo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/jubifesemabituxufoba.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/mebexusukijulexuwu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610603354667e---1799930858.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc32f1b5bd---tajepelonunuwon.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7841b681686be75f74edc9f542b6c411/79191058703.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jutejimavokexurexope.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/25013050056.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/guguxujurewezadafigaz.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/mojan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=neural+networks+and+deep+learning+coursera+assignmentsPDF 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_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 11112 bytes
SHA-256: 39f1dd67e5c4d89580f0812816999a4bad40ff6b8315153f44fa6b6b3c38098c
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 17564 bytes
SHA-256: 31029d142e8556e77e7042d25ec58954db9acb683a59bc61014e544e59bf9e17

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