Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e256a83f4a1e650…

MALICIOUS

PDF

94.5 KB Created: 2021-09-02 07:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d6247f2b7be82ca90b3942efaa2eed SHA-1: 620b474ba06e6379351fff9a623987adcc7555d9 SHA-256: 0e256a83f4a1e65034286a0d30e13ff6198d87eea53823c66a3a0a95d02b2bfd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://ochronaskory.pl/pliki_user/File/8954949109.pdf
    • http://sxhk365.com/uploads/file///moduwarevulokomolifoge.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4630a9dbc---60096743842.pdf
    • https://vinocastillo.hu/editor_up/86803473480.pdf
    • http://thongthien.vn/upload/files/47120619706.pdf
    • http://clean-ecology.com/Upload/files/55590045180.pdf
    • https://eslms.com/userfiles/file/fadobupusoka.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/40f9b1ec3ab9180fcb01c9ee23383bde/vinodukerukugolujog.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/01hqmqqqjcp6iqaaifh3pvqoq4/sumebotozidulumalavizo.pdf
    • http://rm-centr.ru/uploads/file/tosemixojededozog.pdf
    • http://rileyillustration.com/images/agency/files/wixagegowazotunakifa.pdf
    • http://akcjonariusz.com/UserFiles/file/81016538319.pdf
    • https://oliogalanis.com/file/botaburalosolef.pdf
    • http://hoteldanang.vn/uploads/images/files/juxijefoleninagak.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kop8dr31h7fhljuaftbd080p04/10824307199.pdf
    • https://rzfmuhasebe.com/userfiles/file/52303917056.pdf
    • http://cautrucpalang.vn/webroot/img/files/78348530945.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fdd245ecaef1d11aeeb2af7b57fdcec7/69520062434.pdf
    • https://angkoronetour.com/userfiles/file/36532565279.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a8e1f02f2---49412667922.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/240e2af31e66a60fcd8d060d755e1e4c/kazoxelisisewo.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea6b7861f---26019125606.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+it+mean+if+my+right+ear+rings
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9074a366d---sikafokezoxi.pdf
    • 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_off00010f2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
font_01_sfnt_off00012745.bin
ba7241e1a0ee70da0ea2988f04dd1e3e35a46c1b2f0f7a069ed5484255ea6c36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10860 bytes
font_02_sfnt_off00014001.bin
337829a3e9d6a52ee035d8024f706c245dda36a0623f481e4c67d26783ee24be
pdf-font-stream PDF embedded font (sfnt) at offset 0x14001 17084 bytes