Malicious PDF — malware analysis report

Static analysis result for SHA-256 057701a3bccb55a6…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 18:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 66b4a66456103a4af333a8c5e6eb0832 SHA-1: 3c42e0f8bf8232b2cc952817497476cca1d9768b SHA-256: 057701a3bccb55a6a19c9d9c2b4dd31a16a1dec8d6f73eab1c2d5902e2ad46b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically by providing instructions for a password-protected archive. It contains a link farm hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a dropper for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa452bb9b4---65796029039.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609927209c03f---toxovukera.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/80301998807.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094582cbb248---dumex.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a86152b76bb---53914388186.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b0e6b813---rusamomupadaj.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/giruzunimijemis.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa07185009---vezosanugegixovixuwo.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xavubi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3069a06d---novaragukixowe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wunofunevir.pdfIn PDF document text
    • https://noddy.nu/images/file/fikofopibajo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/244a37a632d3239a08a605a029a422af/tutejumipofit.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/i2085ns9omgnosi1bpio0rcj2l/niraxodabezuxor.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/16212042883.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0ad099d84---dasokabu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/522d9e8b17c6496e284dd153f2170339/69554702199.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/powuvavana.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/28827369834.pdfIn PDF document text
    • https://strechybenesov.cz/content/jafijebuperefakopew.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c284e641---18729528056.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/llu6tb3e8ro9kjito046ssv16o/gipobika.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b6e7d7d01d33c1dc7f5ccdadee6599ed/90264262165.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bepiturotogumupidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=red+dead+redemption+2+pc+codexPDF 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_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10728 bytes
SHA-256: 9f17d42c7e785abb9d87edcbb7c784fd8a8c3c5e200cccea0bc9cd5d30156712
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 19896 bytes
SHA-256: 5d2766488856ec9b685ee4fc88c864d54fa415691d82af78c1bf08e07fb98c3a