Malicious PDF — malware analysis report

Static analysis result for SHA-256 1766ddbfac62a987…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 12:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69957c4c925305ba7de6d074c93fa99d SHA-1: 48f3a1e78bb8f4e440aea2d3ea2de6782f39c7ff SHA-256: 1766ddbfac62a987aca383d17226b7c42a2c5c2f04818eb05ec5669a2103f298
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=2019+kia+sorento+lx+v6+owners+manual
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rvodf8vhlg9omfp2fscrq1os4k/sonemiwabe.pdf
    • http://vantaibactrungnam.vn/upload/files/pekilekabiwutejiv.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c46b1776---70243597428.pdf
    • http://oaklandscreche.ie/userfiles/files/vozajigosoropupaje.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0gn58uqtadv05vpbiovu8rlah6/sedokotopojovuletoruwutan.pdf
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/80281855977.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a1ac28950---movosebadividenedupafoz.pdf
    • https://playerpress.com/ckfinder/userfiles/files/sebowabanodu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/77d314edcc1065f4d08d8918c0d36bc1/zutagomokodizawadud.pdf
    • http://www.florentmaussion.net/userfiles/File/wemumek.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/legilululibovadudipe.pdf
    • https://dondepodemosir.com/userfiles/file/kolefa.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0dfd894402a20aff3270fdb0e679b3a5/dobagejunidofapikasafurer.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160946da7e5739---pevoputeradawe.pdf
    • http://www.radanhorse.com/resource/files/80428677559.pdf
    • https://apsco.ly/userfiles/files/65411755004.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd614077f8d---61247018833.pdf
    • http://vstarmp.cn/upload/files/20210810_135612.pdf
    • http://fullx.net/files/36141710705.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21bbdb194---zogexusepan.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/99aaf2e917379dfafc69916b1d1e7960/jolanajubitivafufezozizu.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1fc598d598b3ccd5fe4aa0bcf578792e/47499725443.pdf
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/72021004458.pdf
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/87530358974.pdf
    • 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_off0000dd36.bin
fe27072128b28e5dddd96535983f4768efa9d51afb026971d1d5bc7d51c1fde4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 11248 bytes
font_01_sfnt_off0000f7b7.bin
9badd314ed56517f2308732bc6e2d146c96a1a71fa87d12602ed8495cf26fd16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 18476 bytes
font_02_sfnt_off00012844.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 16792 bytes