Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1f856a40d4eb92…

MALICIOUS

PDF

91.0 KB Created: 2021-09-03 06:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28aa82a1f305668ef9db31201d745834 SHA-1: 0e5e8c4844cebd14d4127a1970d2430a62c1e571 SHA-256: ad1f856a40d4eb92b8d62be8bd4af5669df6db99c0f4efc1b4e8de9546491df9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120491cde2dd---31309611253.pdf In PDF document text
    • https://adikkeempat.com/contents//files/lezikevebanotumadakaraxos.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021080217325773499.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b2576139---17985797438.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/f835bae908a2d1e000e349322eb6b138/zexobomokonesif.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3e3e612af976f4938ce0507902abf96f/77431569195.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/wunama.pdfIn PDF document text
    • https://agermag.ro/mm/file/xowekokat.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0467ac143---kifoxijapewurulop.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ralugisipamozo.pdfIn PDF document text
    • https://zold-kommando.hu/files/41462013446.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/71dbc2f1bb7c3f97f440f0b08771a4d5/53974629613.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d84c77549---befuk.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52be9ca8---joriwabewomuxesunome.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/mivirewomakotufolek.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/82788270986.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/70659794950.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/77742670557.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc53a1c9e---pasiguminofeti.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/99853467080.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hoh25gjbp73h6bmslcb3eh1bif/23551899467.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b0243292f---tosumapa.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/pufufivumijorebife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=epilepsy+pdf+2018PDF 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_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 17844 bytes
SHA-256: 8d1abbba4a0244304c950f14b19cc5c5f3d92f32097af912790d810742307ad6
font_02_sfnt_off0001467f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467F 10504 bytes
SHA-256: ae37fcc4f4b6fab7f6f75042470f2b23ea138c2dce5d35ed886cdc689a75a449

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