Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf402f3aac8d7f0…

MALICIOUS

PDF

86.8 KB Created: 2021-08-16 17:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb253916d0b2f4c6f17674a1da2292d6 SHA-1: 560e28ff6afa5383736fd18d64f91b4dbfedaf82 SHA-256: 8cf402f3aac8d7f0ef94accc17867a9a63cd8da9f2ced8628fbc8a511654ce32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple compromised WordPress sites and other unknown domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a708875d769---zuxaned.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/048c54354ad54bf1d42cc0e79792f5f4/91603049620.pdf
    • http://bidmitt.com/img/files/file/99772765022.pdf
    • https://czus-lukasa.sk/userfiles/file/bodiwemonaxa.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/mg8ackssd3cja676qfi8ld5g8c/jajigigatomexelagujo.pdf
    • https://wonkingchina.com/d/files/39236993990.pdf
    • http://mobilesamara.com/img/files/file/65685356531.pdf
    • https://bustotoronto.com/userfiles/file/womare.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc69ab310ec---45639125439.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ac6790f9---gebef.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hsr4e4l6inalh1eedcmgjcjk55/46779719397.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbcf23fc6---76963314165.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a715ps7kvk8tlp9iidg86hcgf/76552573612.pdf
    • http://chaitraglaze.com/uploads/26186798960.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6992fe2dc8f7448d0cb127ca6335bbde/26633343913.pdf
    • https://mavibusiness.it/file/24848052061.pdf
    • http://jmk.kr/ckfinder/userfiles/files/bizisapuzubotumafinigup.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2e7df3a4---sogapetugusivijo.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a804fbaa947---69482682871.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/qpil3kvmrn16of89ofmkkppcq6/lebajuzufoxoditowi.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gp1isjd40qj5qnq2h52tjf3ctq/90284940933.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/47861275052.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/mekedurutulolufebuwujez.pdf
    • https://napraforgohotel.hu/upload/file/11716188816.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8242d864e---52067981538.pdf
    • http://medrea.ru/upload/files/28168858091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=volatility+index+strategy+pdf+download
    • 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_off0000edce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16792 bytes
font_01_sfnt_off000105e0.bin
fa2371b563d66b451fecf5b36cacfa353d64276ffb31c73caeb7a65a44f3dfa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 17012 bytes
font_02_sfnt_off00013235.bin
e86216ec8298cfbedc8ff889d71ced3195d94a912739bc45c9fc18b799c7a302
pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10944 bytes