Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3c393fbd7ffbe3…

MALICIOUS

PDF

94.6 KB Created: 2021-07-02 20:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d37d66e5e82d9d30bd73ea492530ea4 SHA-1: ba61f1c47df7fb8d4253f280232ed9da0062fb4e SHA-256: 1c3c393fbd7ffbe3565d7aca2df2c48af16aaa639123df9204b4aa119283f4fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb805172fab---laxigirila.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df625433a---96062097742.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd3b4635e---senipu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/merojunanukedo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974ea777242---52681126651.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/40316697089.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0684e030c4c6f2190a497c0d6777a3b6/25673941068.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d070de6081---27325307326.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/62513719173.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3975b29536a5637bf44cc2a6e0013050/ziwitenekinisavivoduri.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0873aabdc82a6068fd7ffb7f31fc6a9a/48489132684.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/61a1b5271ae4f6768f3836b6d9c6bf9f/80643048083.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/rudokadomidorufurusisagat.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160970f4d3ed00---jizekixejikipofav.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5381c5d8---61428533236.pdfIn PDF document text
    • https://oversaslogistica.it/file/poludexonuwavotunorabel.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/62085675946.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66dcc365ac---xawunukixemigutoda.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/16cb206f57bd00fd6a55d0ca588479d1/21171687809.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/belijopixugoxozejusabuge.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/fijusulotinadokab.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1cf7cbea04660bc0e9c57a9e872155cb/21314315018.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5cae7842e9067ff4d862e8344b8594f1/33958715339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fahrenheit+451+part+1+quotes+and+page+numbersPDF 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_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 17932 bytes
SHA-256: d4fd698de2be473c9885aafee238600257eb86a0f4cd0266ebfa3238f6fe2705
font_01_sfnt_off00013a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 11420 bytes
SHA-256: 91672eeaac03bf70274cf3d665f3e30f0d6e5c21d964ac92d7f35670996771de

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