Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47eef9a3478712d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3309aa9230476cfdda12cc990f29c15 SHA-1: 2c462ec234ad3c56aaca383d843d16197b495c6a SHA-256: c47eef9a3478712d31530a3a34b2f751253219ee6e150e140d8e80e0b5a1f78b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malicious redirection attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=melas+syndrome+pdf PDF link annotation
    • http://mmprogetti.it/userfiles/files/suzotojedixosunitimoxu.pdfIn PDF document text
    • http://lagrupacio.cat/file/molusurajaporufojupaxi.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/45059524362.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/gifudiluvejuvobevirome.pdfIn PDF document text
    • http://hydrem.ru/images/file/36205208672.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/moturexukejigigowigapi.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/19448142533.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/rutesogejupelinomosapo.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/18893651544.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vubijoxopijix.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b847a444---segolefodi.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/vizimupejosorewabatog.pdfIn PDF document text
    • http://kaies.net/upfiles/file/jonimurekos.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/zodero.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a644eb29d4f---berejunugevovige.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vamolel.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611219b0cdde0---pukim.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607903f43af3a---kedikiw.pdfIn PDF document text
    • http://www.agot.pl/upload/file/kikazikiriti.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/dagasazexezadu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4781061aeaa81cb971e54af22bb187c8/35653670393.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/wuzegutu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa193b27a1---30331647185.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9903e7eb9---81178291443.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/xanikezataji.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/faboko.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be84fa1d77---jokaginikamo.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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 10576 bytes
SHA-256: 450198dfe4c97dff371aedc641ea8e2f3520f386441b0ccd331cfadaf6b82a1a
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 17032 bytes
SHA-256: 546c3b4f2289d6ccee4352635c6d0b45d378f6d884e148f77c382506eeae7f1d

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