Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14557bcc7be643b…

MALICIOUS

PDF

81.9 KB Created: 2021-08-27 09:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7543924e991b8901e0dc1e9cbe8dde49 SHA-1: ce3febd55641672dd54341c8b111ad2ab124dfd3 SHA-256: c14557bcc7be643b51ba181a8d24e3ceed805ac4a7f7f79a0e6025c95bd63fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://realxenon.ru/uploads/files/mobukanizobefojulidoriga.pdf In PDF document text
    • http://open.ua/uploads/ckeditor/files/77663235136.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/35441834251.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/92278102061.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae4ed2443---vunusos.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609103b101ea9---31430425381.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/dazizuvinubejekajejemo.pdfIn PDF document text
    • http://bptramptour.pl/files/file/37217703983.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096cbd1996d8---71580788131.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8b988da5d6e451c84def976f58ec33ce/22704981066.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zazunutifaladapusibo.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/gutuwerogawujoxo.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/6953912541.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/88269778306.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/82523874051.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9ca7ce2c---49483524738.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/wavaxipikonuzetimomonoxi.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/41680740585.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087679d0fc4d---fedugabuwuvuvo.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/mozupifajerasavi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/wigadafefaze.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/05gmtruchmidud8abugihh95s1/32569999573.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/57abaf692ba8e0f86b59cad6899c2d76/manawerebuxonitobu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/fobopab.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c568936ee8c6313843c87cbbf64dd8f5/gapupewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+biggest+watermelon+in+the+worldPDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16560 bytes
SHA-256: 375032a4583998f3cf666e93248b99f3a52b947a90f9cbb3e480c77c0180b835
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 10916 bytes
SHA-256: e0ff71104ff4b7317a1215f30e29531f0548b1df11d47b2af26a585a3ee5a393
font_02_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1