Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ceb120e6ce90dc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 17:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adbf924827d653f845a6db8ca65db36c SHA-1: a7fe9262937a21d10a0ed9f51d9968354d03a773 SHA-256: 18ceb120e6ce90dcfeb0f7a047f40008ee8158fee9b8ca3433ba0f580fb5fb23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with many URLs pointing to external resources. Several of these URLs are hosted on compromised WordPress sites, indicating a potential distribution point for malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://olterus.org/contents/files/26629332072.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/42662103160.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/37547525355.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f274a15561---vusuwoxugetupodixaf.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10427819275.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/52762953508.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/panevabavedoxefaruwe.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210901/file/16304557763358.pdfIn PDF document text
    • http://ukrfirework.com/images/file/13208118279.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136814330df4---liwelotobo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11336a030d2f2d70f5663b895d2a5a03/52759716641.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/31435758332.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/rabobatikejejel.pdfIn PDF document text
    • https://cristalensi.com/public/File/zivimanulezuribod.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/78gb0l5rgn9n1mbmcbbq1qagml/buzif.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/h0n24l198ogd8otn2paosb9s40/ridime.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vusejisujewodixuginapu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/nitajixedoj.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f884a446f6---xirojasafewimosarefole.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/sofagajafuwuzipipiko.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///morupirazinetemiga.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/72386185370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kingsman+the+golden+circle+full+movie+online+freePDF 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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 17188 bytes
SHA-256: 026ae63dcfb6d92fe926cd6a712b3a45231ceafa5d252daed8479caedcb61a91
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11080 bytes
SHA-256: 8034edc8b685efc6f9c0a31e5b75aa94c5955f90dbb10a4e6c5e5faac8d643e7

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