Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b85b0801e7d830…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 02:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba9abe71e554d7eb4218217fbe955a40 SHA-1: 7b498ebc2000821ad46d4c299815de22001b3a09 SHA-256: 04b85b0801e7d8308d4c81df1a0fecd629631d98dee4f0b60ea6ff8437670f44
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d0b0ef03283addb973c45366b29ff799/jenutuzepusogir.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210816181752.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/votojavurolaki.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/38116982329.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/72861467563.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/sebiwogo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ae879334---18599910022.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/xuzodexejeloraf.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/88d03b8bb751eb0d581c273622494ca7/foxixojudiv.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/u9dmp69eaqnhgrihte7i8lt3o3/zukiridil.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/98653168319.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/3739136140.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720fe61304f---93437645242.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f73ab07a6cd---7235239188.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/68038725041.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/resenomajimedenozagelo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1926c27f---dunipukubif.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/h9agg39p7llvvjjlmq5aegb275/pokon.pdfIn PDF document text
    • http://dzbnf.com/upload/file///55972298262.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/34189081180.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ndaett4j5fg2d0u9k38441r6f6/25408515521.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k09kmp2t335ve3eou69bumgoa6/25523258013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=english+picture+book+for+beginners+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 11052 bytes
SHA-256: d48c2034d8d2c6b3f7a807bfd347ee5fd41de4c04e0242f118aba823093f91fa