Malicious PDF — malware analysis report

Static analysis result for SHA-256 b525e587f3b720a3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 09:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd6cb9ef5343a21d5acd035101de82ff SHA-1: fff24b266f751a05598912593fe6b992dddbf20a SHA-256: b525e587f3b720a371bf25ea4ce7f5408790e4f697d575dfa085f3589178f9b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it is designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160848f34262d4---gepitijowowapuji.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c722025e0---62953818075.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6dce8299---2864248224.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8285a1ae2e1e5aeda2c751fe83d37d21/kimid.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/69228747443.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/wufutube.pdfIn PDF document text
    • http://superpart.com/files/ligepividivibudemogapadip.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161971583720.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f16jmliuhqsdh9guqfk3qk31j1/jedibeziwevu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/74523972541.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9cad64a844f4bb8c5723b8de97e75b4e/letobaganodib.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/zuribe.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fupagupepe.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/96498435416.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/49896245282.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b224856b8c2---91231547645.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210819075543152.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/49437442458.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d632dd78ea---21028905806.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/17003906528.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b65347dd0---320175600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cinquenta+tons+de+cinza+pdf+onlinePDF 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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 10852 bytes
SHA-256: 646f8eb4a13dc62af4c69310af489c3c23dfdab979079ade1104c40b9923a0dd
font_01_sfnt_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16628 bytes
SHA-256: b36d0a43ffc2ab53c9323f13fca89b3a15177faec8110e7c98aa211a9f9c6778

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