Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a42329ef92a6f62…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 00:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcc753b327aa0720faa23166f1af813d SHA-1: 484e301ba099a2bfd9cc80df159a301919c49864 SHA-256: 5a42329ef92a6f62cc8d3d05299bb855277bdd5fc278e519facb0f49cee56cd6
132 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3127

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.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=naval+craft+android PDF link annotation
    • http://besteva.com/upload/files/58902876208.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/senalalajunupisavalixun.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/ragulenenetezilazeweb.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/rijisojonazix.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/wovudidenonemot.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/43373940912.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133528c1ae41---32083430664.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tujebumomokorux.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cddb748f6---71818872553.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/livikikobezuzod.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/bawikemanunefuriwitig.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/sezojigupelagop.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109011231005229.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/lawufuwe.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/17203479506.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/tovobixezepasisop.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133322a61b39---56214123605.pdfIn PDF document text
    • http://cga82.com/admin/File/larevipigabinugaxera.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8f72b227---31185696581.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/72078344764.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109010952544189.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gufib.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/19425603997.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/puvilizop.pdfIn PDF document text
    • https://alariel.be/userfiles/file/54552570419.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10212 bytes
SHA-256: ff6c7a9998e82db126ba5ab303883c15e9450698484fefe58566b9e8bd14bf4d
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1