Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99cee4c8f59a8bd…

MALICIOUS

PDF

100.0 KB Created: 2021-09-03 07:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8214bc80758566d462b00661df970f32 SHA-1: bbf730217d466dcef1b35481769d85c10b62ecc6 SHA-256: d99cee4c8f59a8bdcc12c28e6465dd0227319b2a2df61b2c9ae52037419694ff
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f7f06efb---jetupudofijuf.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da33b0571---gudifozerupozizuxijibexel.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femuxilakajexeb.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021082104545973499.pdfIn PDF document text
    • https://haidangpc.com/contents/files/63638943739.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607824e691697---madulixesus.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/purosureni.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/99333998612.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zatibid.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/26631129983.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/90880888541.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/47286017609.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/forulubezerenojopug.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/485b3af0734531ccdc22fe1130405faf/jutadesut.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/123febdb192f6020cd469cc0697b3068/68765293514.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/79052261395.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083421186bab---zaxikaxuxofugavemur.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nekawuvazubarezexasizuxes.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f142a0ef42---majejaporigilol.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/42832608237.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/7e4bbe5ba77939c6eb5a66c7e512f888/89499932742.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wufem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=applied+spectroscopy+textbook+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_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 10776 bytes
SHA-256: c7ddd64d852f39b6b151e91c6ebc05403d0812cd8696c7230187f255dfee5f60
font_01_sfnt_off00013a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A95 18396 bytes
SHA-256: 620b0ffe0cda718385371dd157ad09705ed6eb933261ab1ea79c276b9bdac36c
font_02_sfnt_off00016a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.