Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dfa98ab921007b…

MALICIOUS

PDF

74.9 KB Created: 2021-07-30 11:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf610c5792d811f2a0fbdb2c6c5fe15e SHA-1: 691322c2931b0cf5bc922097e771ff69f9597485 SHA-256: a7dfa98ab921007b5d033100f780ee793e3eab6f51e07fa979b407d6be6a2dcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also flagged the PDF as malicious. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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
  • 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://marathonroller.com/userfiles/files/getagipuxaku.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/61900409739.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/gukolapakafin.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/jedatitedelapiwugota.pdfIn PDF document text
    • https://medtek.vn/storage/file/turogagepogazifivokadukap.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a73fbf3e2d8---51366218543.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/97267515866.pdfIn PDF document text
    • https://olterus.org/contents//files/22051128533.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8881e1422---polowerifamobiwuxozivona.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4fd264bf151c1be592f267d3e85ad009/pijopuriladi.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/11098968432.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/lupebalajereruvopevalone.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c821468edf---43337589815.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/13800045e57d7acbf9523a327497afa9/gojodujebera.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/9mon716a1blq9qg98tkj18mvf6/vobafikanibilujopejuvu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aef788ac3---70075619938.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fofugoxis.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821ea99ebcf---82298018402.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7f0fdd4f2---7553838666.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc1b8d38---lawumudijeniv.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070026abf468---6498475755.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73b59fbf3---varevajawexoja.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/bizenovemijigewawetezujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nokia+7+plus+stock+camera+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088277579909---zokov.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10648 bytes
SHA-256: 807a0fb670c932a8c139ef59ed1169da198abcd183ad4e499687d236c370f3ca
font_01_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1