Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b37d9ebdfc763…

MALICIOUS

PDF

131.2 KB Created: 2021-07-28 01:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e844b3f575e4944f4e89ff2e0356ff1 SHA-1: 34bafa5c3d929a759bac93f35fa1a65cae286a3c SHA-256: 9b7b37d9ebdfc763d54eafa7e631c0be1027a7634410a36cebab7ad0634e36dc
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates the document's primary purpose is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://0965818789.com/CKEdit/upload/files/vitemubafolunivuruk.pdf
    • https://tims.ro/ckfinder/userfiles/files/wepitipi.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a16ef4e2---43006482988.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a267b14b---2578399604.pdf
    • http://driver-jazda.pl/upload/file/23008958571.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d8b07d94be8af21e693c53e81c6cd7f0/45388847192.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6c7326a3f17820dd7f63e1474d7de738/61382306041.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd47f337058---tinamimuwa.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4876ca264d1db0924224868ee1701b90/69655921939.pdf
    • http://colafranceschi.it/userfiles/files/64778619358.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/67471864466.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8faad1c1826165f3fac7566b283acb7b/8373297851.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/pl7704rllnrubtsav398b3nm86/daluxoni.pdf
    • http://jiangsutravel.kr/userfiles/files/20210724_171049.pdf
    • http://dhleisure.com/ckupload/files/32684445781.pdf
    • http://bilafafafa.com/shopadmin/upload/files/75479472389.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e1f95893650bdad5aa3e538369cb1eea/56634908009.pdf
    • http://wonikqnc.com/upload/editor/file/1623675101.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/e37f4cp87ae6b9ir4g340e26a1/sumavoxabebawepuxo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d300c38e33daaea9038aecfe1bad5102/lomaved.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcec316da5---62662250940.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce879da99e---77961077682.pdf
    • https://ahreco.com/uploads/news_file/71657803650.pdf
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/tunin.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/8f2297929d63101caa4111ca4360221b/zidopodibuledifu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=un+lugar+en+silencio+2+estreno+peru
    • 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_off00019a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A4A 16792 bytes
font_01_sfnt_off0001b261.bin
785d868ab2da875673fcd2bd46f550fc8914cc474912874f7da92b3ec5061d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B261 10776 bytes
font_02_sfnt_off0001cb5d.bin
79000705f0d49602f5ca1f2af4feba171f164f6daaf91479a4910a203210af6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB5D 19192 bytes