Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4a695a2cffdd39…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a30d0616797a89d794aa327364472f0c SHA-1: 2e9d6c21fa8d1027a9ca84fe28f097c15098e90f SHA-256: 5a4a695a2cffdd3972d940e8e2b2873a0c8f79a034f22c119034e01cfcdadc75
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=cybernetic+transposition+pdf PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0f481b5e08155d34304ca0c94969dde7/luxojugoluresovirid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b34e74791fd---mejixif.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210511151257.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa82d937---notok.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7af9ae53---nuwezudixuwuwojoxulev.pdfIn PDF document text
    • http://seamacros.com/upload/file/woratowagowetot.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/g793it2bps9g2mm54c7r9e74n6/koxakakebixakoborago.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ripukubugesanubamugotufum.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/wolakewex.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/lovewimegabivupin.pdfIn PDF document text
    • http://iwishop.hu/file/sikajetinadowutep.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cca1827d42f---mafamojorozavedodexedumap.pdfIn PDF document text
    • http://armanetti.com/images/waverega.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/difoduxu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/54363779036.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/52277365017.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/83bbc527345ee333d174297b0a761766/63868214175.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4e85216796261f4f768800728fb159da/raxaluzipuvugobel.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/79160113611.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c9fc31ad---93750524897.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6a2d31b62dc853bc446962063550a6e5/38138467229.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa661a0ce4---40403181465.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nqosakibbgh695q8mi7tqpbp65/sivogesamomeravo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3825ad57e9---33636973680.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075aad6e7c8c---51372888355.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0f10c0984aad1cf6cb7b803c84060ba/lusepezolelabufubikelag.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
stream_003_off000120e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120E2 16784 bytes
SHA-256: 3a255dde182a0f59ae82d35c2b9020a1adbc14c51e436e7a4e21725303197bc7
font_00_sfnt_off00011455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11455 3016 bytes
SHA-256: 45db3f36125efcb113dfe1e5335700e5eee80fbcd014de91b27c400dbd693761