Malicious PDF — malware analysis report

Static analysis result for SHA-256 6603b1c8e2067ef6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 09:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9460287761f24986de4e801f7d68ed SHA-1: 6d29bb2a56b2eb77c58bf694a072673fdcb12ac7 SHA-256: 6603b1c8e2067ef6a781496cd11be4418a9483de30bf0d0a6e3e5ce081d36d46
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and URL patterns are consistent with phishing lures.

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://cructi.ru/uplcv?utm_term=protection+order+form+pdf
    • http://ecohort.com/userfiles/files/30930780815.pdf
    • http://gorsilawfirm.com/userfiles/file/39941385119.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/98267651839.pdf
    • https://monyetjoget.com/contents//files/8442312950.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/vuwalaruwuruvijox.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e996ed1446e7fa6c54af83f42dffb04e/16765073651.pdf
    • https://giverny-bkk.com/upload/files/limufesezekewa.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3rh1n2uihbqvshs9e04ae2f7s7/93890968383.pdf
    • http://otoozevran.com/resimler/files/38260986147.pdf
    • http://bi-acaovo.com/upload/files/76131562793.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/136b422b16924e334f011d63ada818db/86673873672.pdf
    • https://udruga-invalida.hr/files/lewijit.pdf
    • https://areopag.ru/sites/default/files/uploads/juzinijujakemiweguvuvedil.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d4dc907df1a930bc020d64c998435a20/49745830241.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c282596b1ddf9735a49ac95f1a8eab8d/8519391219.pdf
    • http://bugskin.org/userfiles/file/91089561461.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4130ebd296---lokafuxibokutu.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/supuvinewivefo.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/buvajisup.pdf
    • http://saltokisport.com/uploads/files/sudobenepewuvuvo.pdf
    • http://absolutelyneon.com/userfiles/file/59565232782.pdf
    • https://mepho.hu/ckfinder/userfiles/files/gixelejotowo.pdf
    • http://ecole.ru/text/images/file/zotabuvusapek.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/bj7mf0bhl6jgvi6ma6smtjhg2a/dumemonikewikibazerija.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_off0000b91d.bin
e0d5bacbe3a2718b3a2e535a80ebcc752f31d20ccc4fa4f4c0fe638463112475
pdf-font-stream PDF embedded font (sfnt) at offset 0xB91D 10408 bytes
font_01_sfnt_off0000d0a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
font_02_sfnt_off0000e8b3.bin
abc7eb2c2e1f1487fa050d9042ab275661023c0f1596cf6f2ca3dee1faa39975
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16240 bytes