Malicious PDF — malware analysis report

Static analysis result for SHA-256 391d7d8c92528263…

MALICIOUS

PDF

124.8 KB Created: 2021-07-12 16:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a26d665aa4ae457a55f274b205fc287 SHA-1: 63cc51611975cd21c07b4d9061f8bc49c71cc795 SHA-256: 391d7d8c925282631ac5f200f5b89af41bbf369bc1ca3bfe84b016f8fa9f0144
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://efuegypt.org/userfiles/file/66162884053.pdf
    • https://eyetracking.pl/userfiles/file/pizuxagemixukineritevugi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef53ce7921---dovifowesudoxorowimusaw.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160828e6395740---nodijozaxuboja.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/25219113174.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef656ed3c---77770057708.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe0f1a599f---94755113929.pdf
    • http://satisfytech.com/ck/upload/files/58138696701.pdf
    • http://anvlaw.com/userfiles/file/pafijikukidulaxowas.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa738752b---82430686582.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/vitirewovigipedeja.pdf
    • http://chataphan.com/file_media/file_image/file/fexekusujakerunuf.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9754199f261be0907b3cb96681ba7f2d/paripesozefurisutazawujav.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ghoqe0id7e87a6f4ah0aig3is5/dogikuvomam.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43d5f37b70a6c42a072844b5e42d5223/xugazetibeb.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f20a86ea7---99782432788.pdf
    • https://girl0229960192.com/upload/users/files/momugirorebupipifotu.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/pagufegijerokenulaxor.pdf
    • http://agataklimowska.pl/userfiles/file/12985259155.pdf
    • https://autosaloncenter.com/uploads/files/jepomozijak.pdf
    • http://seamacros.com/upload/file/vogezawumorig.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6c055afc---82068821923.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d082f6a621---16094943745.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/mufavusirewiwuxeluvij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=neo+colonialism+the+last+stage+of+imperialism+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000186bd.bin
ad7e95dc8d4f13ed8c351f4aec8ce9ca87da86417dcf4b7248067999829ad78b
pdf-font-stream PDF embedded font (sfnt) at offset 0x186BD 17444 bytes
font_01_sfnt_off0001b3fc.bin
e043e5f572c601213cd1f4b13ac24a4c12e9300a894011a87b2c647926fe82fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3FC 11044 bytes
font_02_sfnt_off0001cd3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD3E 16792 bytes