Malicious PDF — malware analysis report

Static analysis result for SHA-256 996776660181fbe1…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 05:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c05bb76f1f6fb9fd6c74466a865946de SHA-1: c4f955c20657d6c471b1d9671c6740bfb77a6386 SHA-256: 996776660181fbe1d5933da40bea0695858a549553014c7228ae968708a87fbe
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 suspicious score 0.3776

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://drafthe.ru/uplcv?utm_term=the+largest+shoe+size PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e85c0f3f1---16105313092.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7057c8b6d---60088820752.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/nutuwoziki.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb268955f---29648123997.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xedep.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7ae1opbh2l796qi7t8h2n5a90g/75964738707.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a86328365---78746960071.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788e5e915ee---gufiretenedodidotuxa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68eeea9a3---60024920740.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c540168f7f7---venogiranifitagemuxix.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/504c52022803518fba5a4efeeddecc42/kasaxemepopimexex.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/bununinawiminosiwapuv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xotuwamedolo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2d80208f7175f7e57ecaa3c3dee9bdc/82779863931.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/876fc912b30937d433807a391c779aa9/58045783158.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/545f7b88e07663daed2e413c630d6e18/dufezufexum.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/48033003101.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7hfsuq4bn7pmevjqu96dnk2200/tofipenonasituj.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/beafb2db10014cd230009e1e6d0c7131/56380229546.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3d87aaba42bdb37faf45539f9911a900/rejorulawasi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/jumefasopewafuwowekazed.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/2561272748.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210528154350.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b490ml65b1ah6jc4h2vbpbmqf4/84934551835.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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 17680 bytes
SHA-256: 4f6ae0d207f8c97b311d2cba4a185c8384ede489f74cecfe3e2773555ba6941a
font_01_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 10308 bytes
SHA-256: c8330266679da533df21938592867a38d0adff4044a79cf07eb2d75b6926bba9