Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fee4aa94bcf954…

MALICIOUS

PDF

83.6 KB Created: 2021-07-09 23:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 985b2d1c04241bb792023f987a67eef4 SHA-1: 1b966ad11000b7156954d4e55215f50be57f0a1a SHA-256: 86fee4aa94bcf954d85a0486616db8307acaebcb361c0b0177c82e8f178c4aef
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to leverage compromised CMS uploads. No scripts were extracted, but the structure and URL distribution are indicative of SEO spam or a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/920eb0912f10901d3f0f2810217a7b83/samikunela.pdf In PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/53864c30f46822848c02c25d1ee9ace1/35860059873.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbafce088---galumimixuwidoxenatag.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/64476616127.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1983518d---moxowase.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/792233ff6ca2dc5b4bb411f47fc774f1/devefiritelunej.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/soladafepisopikevemigakim.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6103edfb9---3954028935.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/36534297811.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/bajetevumivomodilenul.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ziravugusa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da0071439---49852897134.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6v86lo3me1bq9vpp4kmr9b2v05/2201910922.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2ed31fcec94f0c54ef1c629db342df39/rawepenabakevimorazuk.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3258e05bf---fabenatotesufuxagowujet.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/87757812131.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c4c26346---wiliwokemelumulomutowifuf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813bd92cb52.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/46495027992.pdfIn PDF document text
    • http://keitbg.com/images/files/xirokivuvex.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zebogatugiwuz.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e08c6be85daa072f55ff0e5494bc07d6/xokubibezakufelurafuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=soybean+new+variety+2020PDF 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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 10612 bytes
SHA-256: 1cbea526858919e91d16a40c1f967ea2c929f2c1b4274f63b972163da1e6c62b
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16868 bytes
SHA-256: 278eaabe0403e67e6b40caaf566a65213d8bc993fee1db7f171c944be25c4716

Open this report in the interactive analyzer, or submit your own file for analysis.