Malicious PDF — malware analysis report

Static analysis result for SHA-256 51beecd9793acd09…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3f5ebf9194380907ea56d220af9d372 SHA-1: c62b770479d69addd83540188d018c87b263217c SHA-256: 51beecd9793acd0903b1463ed5765fce9ee75c05ec8351f76599ff5025765f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://silarperu.com/UserFiles/file/jixasulezejagulawog.pdf
    • http://classiccar-jp.com/js/upload/files/23887721939.pdf
    • http://www.pics4us.de/userfiles/file/wiwidomamepafitu.pdf
    • http://philboyd.com/55127506261.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c8c1bb07---vizogiwi.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef0178e15---kovonudakumekizonu.pdf
    • http://trustarshida.co/cache/fck_files/file/75292969126.pdf
    • https://mackbeks.com/files/file/nunijavuvifaxowasigafore.pdf
    • https://limadelimon.com/images/file/zovutinulijifulewata.pdf
    • http://seyrimerdin.com/userfiles/file/72359192505.pdf
    • https://12waktu.com/contents/files/54218907092.pdf
    • http://gdfsztal.com/uploadfile/files/2161938652.pdf
    • https://iamtimeshare.com/userfiles/file/somaveta.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/tojegukapavozumirumavalat.pdf
    • http://pazarziraat.com/userfiles/file/narujaz.pdf
    • http://gamjagolla.com/uploads/files/rivozeg.pdf
    • http://chandravanshi.com/userfiles/file/lobuxexudezu.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/zokozizumow.pdf
    • http://tivatijapan.com/uploads/userfiles/file/xewujapikurapamar.pdf
    • http://kasargod.net/uploads/file/bosewogadu.pdf
    • http://budaors.varosom.hu/userfiles/files/57936024040.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a17f64a5a---20641533850.pdf
    • http://www.heksan.com.pl/file/6488118446.pdf
    • http://www.asiacoservice.com/file/files/dodofivaje.pdf
    • https://unitjaya.com/contents/files/wapiwiwiki.pdf
    • https://artesapanaderia.xyz/aym_image/files/86154592332.pdf
    • http://wanyuantemple.tw/userfiles/file/matiri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gangs+of+wasseypur+2+full+movie+hd+1080p
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bafc.bin
269acab8649daf8b5601be7fd44261151b474954922c169f075daac800d2329e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFC 11752 bytes
font_01_sfnt_off0000d6d3.bin
8dd340068da8c80e11e32c0e2e0f3bc8f8902743e4324dfd13511d66791d0240
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 16944 bytes
font_02_sfnt_off00010277.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 16792 bytes