Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98b7281e1c2395e…

MALICIOUS

PDF

159.7 KB Created: 2021-08-17 11:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 477d7972d6a08243acfe91aeb973a4d2 SHA-1: e7169717e971e58319a8555090a03eee8d5194ea SHA-256: d98b7281e1c2395e1c5df6a7b2508b17541787ee679cab90e9d7f37741535d97
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8156

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa46f7a932d---fakidugidewe.pdf In PDF document text
    • http://ctkupavna.ru/upload/file/kitozalef.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/64436498395.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/15266534378.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/fibudibakedibak.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdb3a2ef3d719940d21b2074d678263b/8589665781.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lifukokizixurevewobonuze.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/30874653169.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/26317702472.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/81737384648.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/7bpr855rlngjehhoc2u38jqm22/noxirez.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb645ecf---desuvuvufebazanod.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffe905c02---xugagasemekilef.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607794891e71e---sikogezo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ec19e1a9ca1e64788b1fbc661ebea87/47132977412.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/20487648212.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/81903074930.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/wobumalunino.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vak8u0jd43h1l4e1a85n6uvbuo/87046296019.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c7e62797b911dbc7c150fa7c39f75da8/9726372378.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28dfb7a76b---zelesepo.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/litovaperurelazexopiteg.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f1cdeb08a2203946eb412f132be8d934/92389613996.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/j8n5k554e3nj9plj3a9oatpqss/vimalolarimokusamogus.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb09ac94d89217d830615f91f98da47/dufawijijugojun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=avengers+endgame+cast+salary+in+hindiPDF link annotation
    • 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_off0002188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2188E 22336 bytes
SHA-256: 188e80992c91e4bb167e39c8f07115ed04f67b4afd13a67291cb0c379126012b
font_01_sfnt_off000251ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251AE 10860 bytes
SHA-256: 667ef036970303d1ff8f5dd25c5bbd79b26449db418660614bce4a065506f497
font_02_sfnt_off00026a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1