Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8cfe3667e09061…

MALICIOUS

PDF

93.6 KB Created: 2021-07-18 06:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1c95aa13bc0222c269e33c7200ddddea SHA-1: 1f99a1b2a66a6f5c63f608013f41f001d747cf28 SHA-256: db8cfe3667e09061d41adc92ed9fb9360e00375a1963efb106e986d6512d763b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yjccnc.com/upload/files/62691575331.pdf In PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/jesevuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e6def42697b78d0ad5b4fd233393b4ec/bezexibakitipidote.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zepoleti.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/54899014815.pdfIn PDF document text
    • https://makenie.com/upload/files/lezakadofudakob.pdfIn PDF document text
    • http://qzgj.cn/upload/file/maxov.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86239019335.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/39994065961.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2ldcgc0q6eq9tcjt6der87fcj/zavavaxokap.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/65714698134.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/39fj9vhc7u8mduv5gclsadknit/38413675787.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/32721904473.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/woxokelazegifejosazadus.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0abcd8de---69549195904.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wesovekukugutedixiwenu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/f8raggnnolp5qpu1ff9jk7j9ov/85895404232.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vosibuguros.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/56785376065.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/74921572656.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4c385575---fajenu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ac4161b0775aec8a5ff0976c524e8550/16625550938.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2299e4fc25---51245069813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jfk+to+lax+timePDF 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_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 17816 bytes
SHA-256: fda7cf437552addecd84152461f2c8660c20444583f2d60942ac7cfba7f61e16
font_01_sfnt_off00013a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AA 10188 bytes
SHA-256: aac50d31327e25e703ed13e7dab4f87518b3755194a93f788d56173ff5b6dc86

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