Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9cf283eafa9d0…

MALICIOUS

PDF

89.3 KB Created: 2021-07-25 20:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c7ec543baf018b732998dd1f848d0faf SHA-1: 6c126b8c0bbdfff2746b31b07e7a6d31037b5d4b SHA-256: 41d9cf283eafa9d05c995d8c5c6e979d628b796ab4ae6fcab0c4dc9dfa19483d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to distribute malicious files. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://fablab808.com/nbloom/fckuploads/file/66944684379.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e05d866c---52199432775.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160f595c5b15f0---vovuvinukurexu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92dc278685---mowakoluviriwu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/689ddaae761b81af913fe100c6419f9c/xanufuzilixeguferuxe.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16f17f720---82931220093.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/85356488015.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/jakujipabidovogalusidun.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf886ca79bc---96548582730.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/81034574432.pdfIn PDF document text
    • http://i-dron.cz/data/file/40484377062.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea64e2fad6---72287514734.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zigaxodudelugimadano.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/65690029314.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/9894923298.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd940f2898---12179107768.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/ligisanogalodexi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9793f1c878---jitakixoguwapajawelofiba.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ff4d62e5a77e3f60521824ed62df05d7/86584643504.pdfIn PDF document text
    • http://leton.pl/userfiles/file/kuzirijoral.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xepugibetimekut.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/jurutawag.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/5869726474.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2c11fbf9---tubupobul.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ceesr7um0m4e2ka67cf4ukkjs3/30843937356.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e36ac7fa---78163010882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gta+3+game+exe+free+downloadPDF 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_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 16604 bytes
SHA-256: bd6be24add6451f67b3a6809fc0f7843c730bea6f809e56f5587ce8c2eb1a35e
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 10836 bytes
SHA-256: 33bf71bf6840bdebe3786e5523da2e36390bb040c83d88233285c59a66c45c4f

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