Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce8645a36a79eb7…

MALICIOUS

PDF

165.3 KB Created: 2021-08-05 03:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e993c9db9b5be20519b8796973de8d43 SHA-1: 2b4bdfa3bdbc5276a7fb8b62feca35cab003b006 SHA-256: 1ce8645a36a79eb71fe53a25cd5ea401ba31f76d8b4fd7358d076759ef56160e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=cuaderno+de+trabajo+6+grado+respuestas+leirem+contestado+2019 PDF link annotation
    • https://doanhnghiepvietnam.org/img_duhoc/files/91097478696.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/21169752655.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/92fbd762d76be789268d5161a31e3e1a/weluwolazitexisug.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/vetoxagezezobijugenajavit.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/bimijanuwamagexulumagi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7ado1acngnp8h7l199d58n7r37/44396046247.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f932f473a0---84307631708.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tulavawikorutuwop.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210619010631_yrrjff.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020ec0c5aa---geburagekelarudizekuxix.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/kofiza.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210601014354.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972b06ddaff---zadugivupejaputor.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/3714767555.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee26c4631---79191462608.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/nuxafutewasasukamilesiwek.pdfIn PDF document text
    • http://jonme.net/ckupload/files/44510778446.pdfIn PDF document text
    • https://tmtteks.com/files/99904776772.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/81706069771.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0emrpr8pqadec5858vcghsbl9i/90344816722.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe125767a---nipisuwobetotadon.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ca4e562fcc072e9b1da63028d2d400b/nepilena.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/nofuxefagoxujikoxiro.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/73752627062.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/5120263578.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000234a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234A5 20232 bytes
SHA-256: 9a08ce886cf8b41f35bd6e2705ee7a73a71589004ee7448145985271d3e348a6
font_02_sfnt_off0002686d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2686D 11888 bytes
SHA-256: 2b8991930ab322f70aa0fa4e847690384b23c9edac0cbf70d4c6c541d9d211a0

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