Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c241ced7179d00…

MALICIOUS

PDF

89.0 KB Created: 2021-09-16 20:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 964f1c162ba302aeef81ae40e36281b9 SHA-1: a5329f5c4404473c92aadd42ca79b5ba7529f0e9 SHA-256: b4c241ced7179d00b56710142bb0296d229de0f7f8e407b03caefe71cce52c93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent, likely to facilitate phishing or SEO poisoning attacks. The ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yourownadviser.com/ckfinder/userfiles/files/kabunixilexetosuxejed.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/2201765265.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/60fd43fa1082578bf3606f7aa7c8ce98/nigavugevebug.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/gilisadago.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wowinipexuse.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/70604712494.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111549151240.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zexatizikixepowijir.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/popatujofixujakixota.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/zofogojojomagokogoxa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9qhk89h4eq177s49fuvra4ck7b/91322976585.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vixofazuxiduminotododeb.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/ribologavikuwut.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/e10460ecc12f31b8ab6ba46daae396f5/21292869880.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/30307922895.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/1402041043.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/kosodabetelasenavir.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/54679649643.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630817212_960575cff9.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/07555317a142b0913c324d5991a29bc7/89529177824.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165b87b106---63967056692.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/razewevaxagevujenidemowa.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf22ee98d---buforobenetax.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/70473153329.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/61071020907.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/vatukikiselujadetiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=temple+run+2+online+playPDF 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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10444 bytes
SHA-256: b69f69be485760b80a6625c347ed96ea6ec7a4e8b4c3859dc4223356d4bdcf8f
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 18180 bytes
SHA-256: cafc2be13bfb002a9e9a7bdc87221e2a41d84b4392bf554a92bda74fcb0d48f4
font_02_sfnt_off00013e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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