Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3c0a52eefdafdf…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 21:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bb1858e2f2283999f115de6354f69de SHA-1: 2db31cc727145e197dad2f563548450c32edff5c SHA-256: dc3c0a52eefdafdfe98add821f85d14a1d7350a5be3b8151c1225d9462de0ff3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its true purpose, which is likely to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://maginsaatmetal.com/resimlerfiles/wopegujafunebixibusame.pdf In PDF document text
    • https://kitchensofdiablo.com/upload/file/nedixil.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/95637246367.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f0f09070---susujunubiwatogotej.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/21733533575.pdfIn PDF document text
    • http://amandamaitland.com/images/file/sodidawikelivafovidag.pdfIn PDF document text
    • http://vecsecity.info/editor_up/tadil.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/ruxixakevamesitusagoxun.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebb06723---38885596654.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/rodarosotoxi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/nivopoxilefuvizu.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6284976816141d80652c9d.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb52d76943---pixadefisevenati.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7bd5fa5a---bemagutuda.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6f6f56a4f3898825e1cb667f44025e6c/81588388580.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/98623182379.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ocvcukviifv0jlep3tvd9nk5j3/69001211993.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091618375842.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/16387884352.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xojupodelukiwuro.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/ruvibuwosedo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8d9d752e---34731627180.pdfIn PDF document text
    • http://varvshistoriska.com/file/gudanituxivalom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=create+shortcut+chrome+androidPDF link annotation
    • 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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 15144 bytes
SHA-256: 2635bbced7f51321fe351184a7cebbb2e0a1a501a64e52a241439104cb1c1fe6
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 10720 bytes
SHA-256: 2aba2f884a92a999fdbc67205ed3afb8bf2ec318bd9e792ee9296dc33c66de22
font_02_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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