Malicious PDF — malware analysis report

Static analysis result for SHA-256 390854ba51c9f86b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-21 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 693f68372d56fdaf2e3f3f37b66d1cd5 SHA-1: 2c2949145a1cd4a68f326ae746c1a85f5bbca1a2 SHA-256: 390854ba51c9f86bbb0fea20e429879f62816c43bea49499434869956ed0398f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to link farms hosted on compromised WordPress sites. These link farms appear to be designed to redirect users to other malicious PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fac646e3fb6e56a1672f6fda895f3c43/pujafelejine.pdf
    • http://khacdautron.com/Images_upload/files/34159606329.pdf
    • http://nelly-design.ru/upload/files/buwoxigeko.pdf
    • http://hornets88.com/clients/56662/File/wogawipaf.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/24305395537.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160928aa40ff8d---jefokiwobexawemosox.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088ceea7fd44---41935398346.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d57b612d---93177684847.pdf
    • http://texmet.pl/userimages/file/fifovusulofezorigiviva.pdf
    • http://textingrights.com/userfiles/files/toxoxeku.pdf
    • http://nfc.soo.jp/file/guxipemafukaxeguvabaner.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b68f654fc---kitedejorawedoritigitus.pdf
    • http://amuseonline.com/absite/userfiles/file/xugupaxonoriji.pdf
    • http://superfishinglewood.com/uploads/files/29764138434.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3e21895f---85548700466.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/575b2b9711d014417bcf4e64596ceb10/veral.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6bfbdb14---venijupofobasaj.pdf
    • http://paglialonga.it/userfiles/files/bozutasuwawobamadilib.pdf
    • http://arabic.cz/ckfinder/userfiles/files/lisovisuwabubimupalaguv.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b3ed0bba9d4898f6b04b75c45e5cc6b5/tetimor.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xinizalefulibi.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5fe91f09597e9b87450c5811084d4317/davelavebezemowikopiz.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1o6q24a9uptro5l5qbhlpu7so2/dimisibipu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/611d747a40b1fbff049a5ce06f6a7822/xazomazuz.pdf
    • http://magendans.com/imagefiles/file/tapasivepusanikutivedom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sum+of+4+angles+of+a+quadrilateral
    • 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_off0000e7bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
font_01_sfnt_off0000ffcf.bin
10b7779af48a02109cc9d0a1cd87bad02bf5e5adfa022a943af9ff7beba7380e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 17168 bytes
font_02_sfnt_off00012c9b.bin
0d3371e5251a60ea72e28f34fd0ba06c5c3be1afe900928b0e45a8992fe3dbfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 11096 bytes