Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4080b3814b2b34f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 10:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da93de5192ddef319f67858e97523f8a SHA-1: 90d17c51bbe85327f8c165a4f972efa57a3e56d8 SHA-256: e4080b3814b2b34fe595a6b5a356b93499b56e130f9601e8063a96beb943dd02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=hawaii+match+3 PDF link annotation
    • http://yokohama-model.com/userfiles/files/76829182781.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408f8cb372c---11132969567.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/653db15b4c23864ad50a3f3c1268b444/45411988118.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nulenobujusa.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8027133---datebaxukal.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614835747095f---57045134113.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/94236958722.pdfIn PDF document text
    • https://cityface.cz/res/file/tuvepuwamedamijejewet.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kidoxiwanibabuvazi.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/80802296034.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/dogupu.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/36002611190.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/xuzixunivav.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/niwovim.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/23420876392.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/lubakufojodizofizojota.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/79381893580.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210905224641.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/98155914572.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/lilurajine.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/dafoxejewidegojofezakivi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145017566651---rofujad.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb6ce4b07c---65786516302.pdfIn PDF document text
    • https://medius.sk/userfiles/file/24436118107.pdfIn PDF document text
    • http://klpa.net/userData/board/file/45496689392.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/rexabama.pdfIn 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://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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10072 bytes
SHA-256: 7870ff6607b37541c4a1bc1b6626b3dea886fc0a160d126cb14f5ae3cc91d2fb
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 17140 bytes
SHA-256: de106802dd70c0c2038f941835df628b8409f7920c1e2f8a75594bd25bf5b469
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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