Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbd7bc8c8c7a43f…

MALICIOUS

PDF

75.5 KB Created: 2021-07-26 00:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ab9c9c8f32d513078b590fa74ef9b45 SHA-1: 9be47ab0bbf7c452a79a39f3cc0010304554f058 SHA-256: 4fbd7bc8c8c7a43f1a96610d4f45c11a0162708b31e95ad55361d2dbbe63cae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm hosted on compromised WordPress sites, with several distinct hosts and a high number of PDF links. While no scripts were extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/79286b68fde64b1a72a4b8198a916869/bidogelexorozobozu.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/jileduwomefi.pdf
    • http://stepasidemedical.com/images/uploads/file/kufit.pdf
    • http://ctm.it/userfiles/file/neputugawitojulujowefaku.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagorusopobosixo.pdf
    • http://2ds-creations.fr/userfiles/file/89197966149.pdf
    • http://bensonlandscape.com/editorData/file/41758118501.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hb6q47am8nk3ddqblqo7hks8av/11766513175.pdf
    • https://bwawarszawa.pl/upload/file/wowivobowi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/62d2c8783a64070d462fe12eb33a3307/92023230488.pdf
    • http://vnos.vn/app/webroot/uploads/files/lomutexogejafokivofeb.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbd70753f---fijefi.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/88836060881.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/55747326131.pdf
    • http://montgomery71.com/clients/34132/File/96944004023.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/414316a3d6d1705878cc392ed65c8ff8/6438378494.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/55e81eed985ca59793b9506dde52e26d/dofit.pdf
    • https://livredart.com/ckfinder/userfiles/files/17606959609.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bouhprts21o7mh23asprs23h2k/relotezirizimafidexirafo.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i5026915q9htpno3dr8baf3gd5/januna.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/pegozetowevajoju.pdf
    • http://banphimchuot.com/userfiles/file/85096434075.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b9e6abc292d8368e7814a19e3a7fc459/77378119240.pdf
    • http://rotarylaspalmas.org/documentos/file/17320766168.pdf
    • https://infoenergie-loire.org/userfiles/file/ramekupokafugagot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tp+link+wireless+n+access+point+default+ip
    • 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_off0000c2b3.bin
2f62863733f0f2303711a2cdee441f3239d25609c858e72e1bc991016ef05e64
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 16096 bytes
font_01_sfnt_off0000ec5b.bin
7a5e3ca9b1d743148cecc637dbbdaa04f6f4676113b40fc303aef34a1a9fa862
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 10852 bytes
font_02_sfnt_off000105aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16792 bytes