Malicious PDF — malware analysis report

Static analysis result for SHA-256 4018b59a02cb79b1…

MALICIOUS

PDF

221.1 KB Created: 2021-09-05 02:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a6ccb140152a109ce1166a87aa54321 SHA-1: 309737c8040d05e0c2f4c7cfdfa6bb6d1b9698bc SHA-256: 4018b59a02cb79b191ab787d78d6be0f550d74697dd26b20cd1c50c988b1660b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://scottleddy.net/clients/862555/File/goturikevirinuwokuro.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/7f1e8962d258b3d029a7578f2b6495e0/desabatekofaxekatadeba.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/tuvudoxizitofewovi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/us0lh5jd08ph6i1mi8rqaa6e6f/62798510724.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/26788946570.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/vonilonapapekidesa.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/q64au1fs0a56cf5fa35s0dd5t7/5796813237.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/21190009920.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073d82396a82---xelesimeburatinepo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2e22f840b848870dea3dad260b892be1/80258420706.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/68050528758.pdfIn PDF document text
    • http://petrduchek.com/files/gigusibog.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/muzakigofu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e55d3371cc4---19850328406.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610faf2c54a6a---81505897796.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/5b271734971e170906774f132fd5bdd8/85981320901.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/34427856822.pdfIn PDF document text
    • http://aromata.ru/upload/files/74444103895.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/6541300067.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/wirinixoda.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/badibigiwopubifutajajusel.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3e6af808---95146910971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=stabilitatea+navei+pdfPDF 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_off00030034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30034 10384 bytes
SHA-256: e40bd96413b5bad20dcf9fd7ce8a12dc8cd9510c62b2a17de036314c34c213c5
font_01_sfnt_off0003179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00032fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FAC 21352 bytes
SHA-256: 6779c506b739f4658a8c16a73fed2a88fffea9687e4b2a388e85019dda335930