Malicious PDF — malware analysis report

Static analysis result for SHA-256 23173d0d45c8a387…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 20:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cd6eb6abd1e2d4506da3fd227c52897 SHA-1: be50edcc575ce2f188051da1bef7c5f5c2bb2674 SHA-256: 23173d0d45c8a387da13c57420595b68b43657a081d253f1541ebf044db6bea2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the compromised CMS upload links suggest an attempt to leverage these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161041b1d5b6b4---5036462677.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed6915bdd---42409324268.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/sedita.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/65e3e5c92a24efe0a7a74c1d2384a445/selobot.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2da8be1ea---bugab.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k3om4tl1hrhu2iuvivtn0eqqn1/64655323929.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/25458254096.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/sadele.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ee4af9327d393f1e87960b6beed297df/39500970.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/79908113605.pdfIn PDF document text
    • http://freeski.hu/freeski/file/98724341296.pdfIn PDF document text
    • https://0900107678.com/upload/file/zajotiperavazonaxorimuran.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/fejukarorimoza.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xadinakopoxu.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/gikalalirukusokawoko.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124af23d2f18---44184006165.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a4fcb4c8eb831b5de394d3ec6ac10d84/59298908896.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/pisegepak.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zukaxakobududafajosovop.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160927cf66ba95---fawokogeruxotibo.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/85551938962.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/rikexeriwese.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/28045546710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pay+it+forward+grantPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16852 bytes
SHA-256: 25c73880439daae83efbadd5bc60cdacbba22e85630a9c2bfbe5c2e79644efef
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 10384 bytes
SHA-256: 286c2818a03864e0e054100bd9c4797e3e8a9e76de41a0f966124c43676c3143
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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