Malicious PDF — malware analysis report

Static analysis result for SHA-256 add663a41b4df30c…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 00:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 816077d1c67e04e5da1b63c7be69bcf8 SHA-1: 50abee940482f69e7f70b75ed06598633fdb636b SHA-256: add663a41b4df30c7a8eff41693e7e6130c61ab2672da09d5fc8696b5993ddda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates that the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=adalimumab+package+insert+pdf PDF link annotation
    • http://vejwun.cz/images/bugomumuwufiva.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/o50lhbgdc9v2tq6scvs8degjq1/11363843149.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa597ba0875---toxelogu.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/vumexamavoxusoxe.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/79804596965.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/56651664660.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/61915018944.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/15714411899.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/valodanop.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf6690c5a---fewezuraposo.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/lenopojofiporujexemovupa.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/70698083219.pdfIn PDF document text
    • https://yasacompany.com/upload/files/dirarumoromadupepawep.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/peguvutagelir.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16127397401892---rozisisulojozof.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/sokoxowavilovoras.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/duvuxijanukixedem.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1df8c9f13e50acb97c5c90981ff21235/rikogati.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/33659475027.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/salamudenojimojuzanal.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d671e943df---kovobi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/diwebupupolatir.pdfIn PDF document text
    • 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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 11156 bytes
SHA-256: 7633b7207a4faf4bb71bea4091de0473fcb65e2dee98974c1252e875db7a4014
font_01_sfnt_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16480 bytes
SHA-256: ba0c61bb5800eea9c609de01d0ca27385e81c673667d3fd9b7d6b3bc796b929d
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1