Malicious PDF — malware analysis report

Static analysis result for SHA-256 936d76d57522915b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 14:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79bf5bc2b033fbdb3d88d3ef42a9fbe2 SHA-1: 222bb240cc907c3cf6e01714df9479cf527f8fed SHA-256: 936d76d57522915bafedc48c4d42d934d112d8c535e1883d82bef7af3c9d91f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs associated with compromised WordPress sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494e8490a1---pinore.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b858be9e79---397719102.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/tatoxev.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/worawosusotesudoja.pdfIn PDF document text
    • https://path.mn/userfiles/files/logoveteridunoropujafer.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/sogolizebojubuzovisosi.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/vupitedul.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/mewijaderavivedeb.pdfIn PDF document text
    • http://mq-water.net/upload/vusavevofakubipe.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nogerawef.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/53411816193.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/97927369608.pdfIn PDF document text
    • http://jadeite.ru/images/file/53331303449.pdfIn PDF document text
    • http://boldogelet.hu/media/gukomarobikigegovojapug.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/bokezukazurufakuvo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191121338221.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/97898759411.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/37305485354.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/44f9eb8a6031f5f11eb3a4abfe8698f8/87955820290.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/97373736159.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/vupewefejadilifum.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_192053.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/tevuditidiraliwopuxedov.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/43720001210.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/170023317131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=smartfit+app+for+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_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 10388 bytes
SHA-256: f204de9b4ef7222e377b30a670c8c8cf8f43f5d05417d0682abbc82a3abe382a
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 17308 bytes
SHA-256: d83f6ebc234af457ee4c8e805c68a282f72cdd7bebeddb357978eb9100b726ee
font_02_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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