Malicious PDF — malware analysis report

Static analysis result for SHA-256 524eb8eb35d8bf2a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 22:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4bc0dcaeb9672530128909a7aaf082e SHA-1: 85f153314d28ab808ffb593de69cc868462c28fc SHA-256: 524eb8eb35d8bf2a16cf41349087a672195d485868ef3136baa54be569715695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aplus.to/userfiles/file/48295871271.pdf In PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81125943141.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1a8e914d0b92dbc6a9724fc5506ca971/zewasuwuvubamifepe.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/lukevomor.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/58682607936.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/nebemere.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae4b93492---gosozege.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610790cbeecce---lorejuboguj.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7df23ffd7---jinif.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f3734ebbb---4484730341.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/sopoje.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/salijiduduma.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/sekogagefarizoz.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/42338003239.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210730_132935.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffecb7e7ef5---36148002257.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/bebuxavixuvebox.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tasipotufutobadegexuxof.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/buwufidugaxozorubumufaw.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160884482a6384---94537752123.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/63205335175.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/zinadukujosu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/71126603570.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/19142222086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=enfermedad+de+kawasaki+pdf+2018PDF 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_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 18392 bytes
SHA-256: 0cd8f7d438bbd74c43f5efe5cb2a6fd10f72b554ac0aefa576748362a4e18bff
font_01_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 11056 bytes
SHA-256: 91895a05b3cae68aec000b42a26f89f18cfb403b5adcf4b6e0a0a2139a071e9a
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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