Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e8f6ae05d78a47…

MALICIOUS

PDF

92.4 KB Created: 2021-08-21 20:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fce867e36b7bd2a2f781138291820050 SHA-1: d4f8956860ec01c7cd18928c69e194cbb40c6db1 SHA-256: 63e8f6ae05d78a47e31c7ec6a6804358c40f8b468839ebfca3d8a25d59b534ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/ee07e51b29d464e0ead7a041f9fb80ca/tewamevotizose.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6e5ac5b26ad0e1c66f931ac8a04e983c/57829770237.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a237ccd99---rigadodefupejujekibopibut.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61b73b0b86---57679439080.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/lokozujobisumexibovanov.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/15098023470.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a273c3594---32846458184.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607925ae790d5---54893925148.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f8b11f27---69804606986.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lesuv.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/muvejunewurawozuwuli.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/83579118784.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f6f2f5191181334ee85eb2475b7679be/gazuxusu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdt1d7h5mm44j6gm5nl1fq7e1d/95780722069.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3573fffb---mesavutixusavodofig.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b505ed1d---3798393588.pdfIn PDF document text
    • https://hirurgija.me//files/memuwumejakuz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5ef726e6---tunezoluzefo.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/nerimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+the+369+manifestation+method+witchcraftPDF 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_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 17348 bytes
SHA-256: efd43081f26112e4777b810cbe45033ba02f7bd73e2c4ef109cc5fef3fafef6a
font_01_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 11240 bytes
SHA-256: 43d6147316a20c4ce2c2d150a403222088ad4def13832f37ed386b2343128934

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