Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac09c5d3d61c3819…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da1ed5477f10f2a0bd27fb4920f7dd7c SHA-1: 72433e8e33a43eb66e40242b72fbdc04a9871910 SHA-256: ac09c5d3d61c3819942b24ebb8ec7c35e494172ed83cec7d1f3c4667645186cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to external resources, potentially for phishing or malware delivery, as suggested by the 'Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=league+legends+wild+rift+apk PDF link annotation
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5a09024c---mabuwe.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/10215401569.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/pujumebukorexeme.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9af91fd1---82980122926.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/87795126087.pdfIn PDF document text
    • http://mariancozma.com/_user/file/74678154399.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/58080645252.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sutiz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614918a0b3d97---13538300489.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5b44e196---tanirabunisigidowob.pdfIn PDF document text
    • http://ossokahve.com/upload/file/bepibojarifezag.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/52407942474.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pimesowedejojewun.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/nojofakuxinikoxemoti.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/40457947789.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161334e7be82b5---walolugijijeputobufa.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/ranefapi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/628fmro5aqaoq8mnc6klmfi8b1/kanologatazavalejuloj.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/zavaworunete.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/46603204932.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324b672bd1e---wasajelonajomadawosifanas.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/30024357491.pdfIn PDF document text
    • 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_off0000c3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 20788 bytes
SHA-256: 8d6a5391ed05c464556da357a8a01a64ca1761bb430fde9643a008ca6e144eb4
font_02_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 10788 bytes
SHA-256: d3d89d3f5ef28e363c263841055e879af15489f36ae0c1a06d830db72e8b8375

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