Malicious PDF — malware analysis report

Static analysis result for SHA-256 15117b3d98013747…

MALICIOUS

PDF

92.2 KB Created: 2021-08-12 01:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e65a723f95c073ff287481074e920ad4 SHA-1: e6fb0f52dad7d93a4e9431ee0730aa69e2678c7c SHA-256: 15117b3d98013747fe52f57905637c09fdb85ad6d267e3498af007989789e36e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://anandamsanyal.com/userfiles/file/fibodazedom.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df0de02146ddeb243d6966dd86e7985e/numekonabedufapusabobid.pdf
    • https://ddshower.com/ckfinder/userfiles/files/18724617289.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ufduum47mq5l4maa6dklqruber/81328544118.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c54490b---sefexizudedaj.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l7rhpdvkqr4c80ebtljor057p7/73292216496.pdf
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdf
    • https://sportnazona.bg/f/uploads/files/21054135563.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079c909a1531---30600095950.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pufozugawurutid.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/902b8ddf4b44706908bb06c8fcd0578b/66024089814.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073417cba86e---41133791110.pdf
    • https://vleek.com/uploads/files/44816756916.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/cpdjmf209t6o42kl6eq0l9fpak/basovibume.pdf
    • http://dailymaytrogiang.com/userfiles/files/tezudenumubakabugasixin.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/88f7d617622aa771c3029dc5c01f26dd/wivap.pdf
    • http://teckim.it/themes/userfiles//files/25384774820.pdf
    • https://ymy-tea.tw/upload/files/muwenevuru.pdf
    • https://www.ojchamber.com/ckfinder/userfiles/files/41226083758.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b314ff197aa---4332304154.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2eef07b4b---mizexoditonagegojugotas.pdf
    • http://georgewongdesign.com/gwd/upload/files/10603261394.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d4aaafdb8---kadezubup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=modelo+de+amparo+indirecto+en+materia+laboral
    • 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_off00010469.bin
4c681228090e2544c6ab93e11998549751b5f5eedfdc3feeab7c64a7c4951770
pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 10640 bytes
font_01_sfnt_off00011c71.bin
51b50bcf3d76e286f641922e547c77c0ee8f0c507ef570426c0b7d17fdf4d9f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 17816 bytes
font_02_sfnt_off00014935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 16792 bytes