Malicious PDF — malware analysis report

Static analysis result for SHA-256 6399436aaf7ac9db…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 10:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47a583b90e4bc9db93924722d0454c6d SHA-1: 88e347d253ad12a7a68d581372e9b2640b532333 SHA-256: 6399436aaf7ac9dbeafa1d25f079b1d88490be71f4602cabcb417e6e193cfd8a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekunigamiganebegasuda.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/26063320402.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/81918234340.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qfk31mcqn39gbug79k596l6g65/xugutu.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/zuzajezupipudaniko.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109082038567957.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/66116877180.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/togup.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/fimumor.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/90219686439.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b12be25c825225faecfa803dee831853/misiforodusetabeb.pdfIn PDF document text
    • http://ternovykh.ru/content/file/92113055662.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934e46ef2a---75947034151.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kofolukotixud.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/89143861761.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/77684145825.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc917b7d---fagupuguxabowu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db424ffec---xubepaxetaxajidoteluxinuf.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/jikizimibelife.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/36484071713.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/75654001208.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/29450682915.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134228396d7a---77375632660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mirror+windows+10+to+androidPDF 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_off0000b94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 15012 bytes
SHA-256: f4dcefb881573d2b9f839bfe6bc2cb57595d9158d014b404cdba1d4551bf0b03
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 10316 bytes
SHA-256: 0260e9aabc6724e4c9f80c93368174f07a023f1cdf3b70075f09c7e32a90404c
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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