Malicious PDF — malware analysis report

Static analysis result for SHA-256 8619f6df9bb919b0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 06:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e696b36388491fc5e047fb05595cdd10 SHA-1: c68ba5f86680a8625bd90c1fa39006fe62cac282 SHA-256: 8619f6df9bb919b0f184e28094101c146856babd0f91a09a7f0cc4790d934fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress upload directories and link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nikoljski.com/ckfinder/userfiles/files/rajofufovobelexefonepi.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6407a05b---fufubibonasujotonana.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613692e785d92---71439737361.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/86075749338.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/dujok.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/xulas.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/33688141710.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/77596302976.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bewanizini.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/28322639939.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fikofixujuwodogopirezux.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/dumafikutudu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/notebapumigeri.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/21600023891.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304eca643cc---27831718787.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d266cd946---87041693632.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/16860511332.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/lapamavebifuduzigozu.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/texenesivuzesukowefelum.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vexerifaxukagokigerifino.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/61754777376.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/duxefanepitafaren.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/jurubikemuvuroguxu.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/15253083062.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/katof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=skin+hack+mobile+legendsPDF 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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16736 bytes
SHA-256: 9556badf8ac17e9ba36abf27add5e3fd25a5667bb0337be8ba245f9f1ec776cd
font_02_sfnt_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 10924 bytes
SHA-256: 98758c209cc7c1239af78219cce44fee830d2bf7499f32449af3cd8823f5d324

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