Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b976dfe31e155fa…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 17:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb106e5702837765c78cee6dbe415157 SHA-1: 599d24712c99cf9340346f47f2bd03063daf2be7 SHA-256: 0b976dfe31e155faba176c3306d129f703e202d46de4cac9d8dd14455f74a158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to direct users to malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://inwebjor.ru/uplcv?utm_term=komunikasi+bukan+lisan+pdf PDF link annotation
    • http://www.nagsa.es/ckfinder/userfiles/files/90569501690.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab92e0e84---80043003218.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/temubi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/51928218640.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f82b942f8---10621833275.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/50e6d1cd1d00d1e874781e86dc3ac2ef/govafifugaxaxukawumolujib.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fozijodudokemotafibekit.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/804574cb2af20936e2f1cfc2b04190e6/23871663431.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/81fe6365bb05260d2b06fde34db3657f/44260966101.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/57acbf4518f7453d6031bf8a62faa8ab/gasuluvudixidinaxokep.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/31304504410.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/sabufebuboxatorebavizim.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3925580---sazulujomurotazan.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__610CA03E2D50C.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/vabeven.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74853676726.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/da3001ed1b0ea3374701b1e1ac2f896b/pijukosawuxepu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cabbb36---gidukexaj.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/112332449611c8923f00a5.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607045670b1b6---xofepadefa.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/nosewufutovogawekusitusi.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/56849514318.pdfIn PDF document text
    • 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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 10652 bytes
SHA-256: 9064302c20346dcde882d22a5575141d06b436dd67e84671678689fe397fce4c
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 18372 bytes
SHA-256: 52b5eb0bec499c5918ec405827440dde87431b6f12f7f0d7dfa9f7db1758f6bb
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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