Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cff59df98aab99…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 19:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1608f2812865f6ac5c60b074d38e7dff SHA-1: 221d8fdca80249d5906a083b1aab7ac7e9de5e8d SHA-256: 73cff59df98aab999c1ea0e0aa049c8a5070ce1672f3c2c00244b570d2707cb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e574200f---jagofotizitasulodevewiwex.pdf
    • http://togul.org/sites/default/files/file/15044462645.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/48029070269.pdf
    • https://bandotrading.it/uploads/file/58357221.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d85dc621dcd---15412164424.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68d7436c2---80915899649.pdf
    • https://1877painters.com/FCKeditor/file/gidafipapanigofapex.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f806ecdd5692a1853c941d46e2c8e800/gasijete.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sb6ssk7m80s5nihbvg1fl5os6b/magevefufakidiranobavipez.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2ca1e317---ravafinoriwilotirurodi.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824565b55fb---mozijufifogojawuseme.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86da8575a---lilaxafigaxiwajefivuvono.pdf
    • http://dominoliberec.eu/images/file/files/rogijevebimesukepovoxizix.pdf
    • http://congtrinhnhaviet.vn/upload/files/11249136611.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/buq9vj91gbjdfddgqb85scdcf5/bonolazivexapekarapa.pdf
    • http://volamtuyetthe.com/userfiles/file/14280357089.pdf
    • http://imbirimbir.ru/files/48913016370.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/234bfd16833a8ac3cd73a7abd8da2c49/10295775791.pdf
    • https://p99.tw/pro_pic/files/18068716598.pdf
    • http://uralteplostroy.ru/content/file/mefoxefovulavi.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c432daed4---94270457913.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9451b4fa---63538705360.pdf
    • http://sevimticaret.net/userfiles/file/miwunelifesulip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=curso+aprendizajes+clave+ciencias+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/404e30bbf6d1262d184b64203484379e/43238780907.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdaa.bin
e7de1f005549e54319a6ffdad1fcec6981bdbef228aa300bed9e8c3fd0fdc57f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 19464 bytes
font_01_sfnt_off0000fefc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
font_02_sfnt_off00011713.bin
96e5e0ad7ec4221aa78d814b59262a9bdd37fbc8986e21af2d933b6fff48d16b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10900 bytes