Malicious PDF — malware analysis report

Static analysis result for SHA-256 d001fa9b0dc4f2c8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0a88de65bd0552163b5551a1a89eb6e SHA-1: d14637544f665847e4992f3a87932af0af612aab SHA-256: d001fa9b0dc4f2c8c2b794774e8405a40136040013bfc2187ebc75147b6f1d29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host or redirect to malicious payloads. The presence of JavaScript and the link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ac-kenigsberg.ru/files/file/46802847406.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/88427310479.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061901431639.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021080809012973499.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/5844678333.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/73424973423.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/5622616552.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/savitipabut.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/bupuvigopipojuneniwup.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5q4nev7mce938bjvon2n4fecf/79139222298.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b096ccd8---65693102270.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bee5c1d1f---somuvunaxudo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/e60e705426e2fd227becde7956bbd46f/16437139336.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4097e4f8---88205013854.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d7dd91f0---1955556465.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/nomadiva.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f0d4qgdmvirr8490sp518easa6/52053112575.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/67144747838.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5e17f43a---vifobawatuzaroruv.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/mojisizegojakew.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fafalororivezevuditijiwo.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/mevobidubil.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346a9c7ce---popudexijesasod.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cc104a358---79957420169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=1861+tower+musketPDF 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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 10476 bytes
SHA-256: 2bb61661a1bd8435d3160402213fe7d1f0aaf551d81b20d34d2f9dae5ac079ed
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 17928 bytes
SHA-256: 1dea891f98d1e9346e2a219a5997467d057f31c826b736dc55b0e9be072292d4
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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