Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd964ccdd1a17142…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 02:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e357d09e569cee6914344e7f98ccee85 SHA-1: d0dc37b02cdebd535cbfaa0e5a1455e162c72e24 SHA-256: bd964ccdd1a17142891573e6d205deea1f348a8a4c50b010a93924e77cd48da4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bd544a57---51662586873.pdf In PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/93341309831.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/25972837687.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2b70da6c---gariwefezunokuxonotimupi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/55907233358.pdfIn PDF document text
    • https://heyratacademy.ir/file/lifuvakilunetawa.pdfIn PDF document text
    • http://24cvety.ru/upload/files/xonukazolu.pdfIn PDF document text
    • http://nova-auto.com/upload/6583988707.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210918082702.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/jovaluzi.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/witanojo.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lerosixobavamanefomu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de3cb4d11d60caff74b8312b1b2a73af/92245345938.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/27848668965.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16143f80051b01---41391305696.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/zisuwupi.pdfIn PDF document text
    • http://surausa.com/uploads/files/65677080131.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/22123382463.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4b4fefe5f---kigojutom.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/61974032552.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jojivad.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/95587601273.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/13534304093.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/nuwajuba.pdfIn PDF document text
    • http://sns.hu/_user/file/xotusewakolonenopum.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/deveduvapokuxubew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+pixelmon+on+minecraft+pe+ipadPDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 10972 bytes
SHA-256: cbe3324f25c9bdc568495d1b3431e308109c5a9c512521f7d8c75dcbd830648b
font_01_sfnt_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 15736 bytes
SHA-256: 01701727fad2564538b41d7fc0ab7492d3f53668978ab01448b27708169cdbf4
font_02_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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