Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f06b527a83b627b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 02:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb89a7554ad98a3b0699ccdc4924c0fb SHA-1: e69944a7bb9c6c55f2ef41e1e65528bb246920e2 SHA-256: 9f06b527a83b627baf43ece8cf30e58724575b1bbac150f46b59c0a7cb6f73d9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to obscure the ultimate destination. The presence of these links and the PDF's structure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c8ccdf23---79046634561.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0db6cff---josatorizo.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/rironedavosadoluzedekix.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072169e5c346---rovurodugukagozinemiwu.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/lofikusatezotalefekaz.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/4219621993.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/td5vlht0tblaudtjgtjogkc6lp/15826443456.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/watub.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/10896790004.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ed98d09643eeddc1e68936cb0517a254/bupimejadapilotusupex.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf4e72765---bijogugomotunuriset.pdfIn PDF document text
    • https://haidangpc.com/contents/files/9827093654.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/73e368ca96ef257d57cf71f09a1f0a75/vikodikeronezasedoduro.pdfIn PDF document text
    • http://contextuae.com/resimler/files/libosusa.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/28257257590.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0d7a114dba3b28b85aba3b819b3cf0cd/87362220724.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f288bd11---kidenukoganoti.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/50c4e0fada9a5ebab80c25e0928e7181/tunekowesofunexuw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf31586da---99733060838.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tobiziragipugumijogim.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bbvglvsk9pqaemu9sph2tl6s30/besusudafuluvojovewukow.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cb2d593d20aee0c796124fdd58abdee2/pezenezox.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/segusixubewetosedap.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d1951f2f1ed---ropibonematu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=healthy+eating+index+questionnaire+pdfPDF 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 18668 bytes
SHA-256: 72f3597e98b50821dfdbe153035ae2a0baedadb0104b6a0706bb25ae95489791
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 11228 bytes
SHA-256: 63d60c24d78923b3ad1d4c1b2b5d24005e7b00e936674b4e6d23fb3a7377d4b6

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