Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a665a4dce4cfd0…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 03:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26f7f175e8f4f73677b7fe9d306e491f SHA-1: 0d46e38bc39dbcb03941057eb980c7d60bd10b40 SHA-256: 33a665a4dce4cfd06d3130c10db27042042e49356b4861286f1e89620b88a49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to deliver a malicious payload via a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ec6c447c---vurizude.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47e8b5f7c---fivogujiti.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a82ea01c3---rexanazafe.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a0123c2b936c8a212003148bf4a16aa5/tosawigimar.pdf
    • http://china-hold.com/UploadFile/file/20210517005152286.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/tibunoba.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6a60ac01---diponuki.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d6287006346479746b00ce2c4960b16/wabipebijidofovosen.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/te6r3je04ucdq809n4nc7gru85/rozixekekupimizen.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1f6e0dd0---60887329326.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a8f0ef871---29018538749.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ef470c4c---musebawibenipuwipovonis.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e16778f8ea---bumudipodu.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75fc4f22d---61894521427.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1865e8c34da837fc04e8d3fa8abeed49/44526627728.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79be77b36---tiwepube.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60fd1cc76---98532561525.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5e8b7a66---31198618795.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=driving+licence+website
    • 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_off0000f6d7.bin
358b103bf88cb4442a3c3ac47d95d000c2164c981f53d2cf0e79cb79318cef1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 17128 bytes
font_01_sfnt_off00012390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
font_02_sfnt_off00013ba7.bin
07d052ef8ee265649807e27fbcbe29663176a3a067ae8948c50728ac5a409083
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA7 10416 bytes