Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bd41dc919cc5af…

MALICIOUS

PDF

92.2 KB Created: 2021-09-03 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7b01b59f37d6b79cbde52428ab39ff1 SHA-1: 71f4f3c3bfe8a52e7ea1065e42bec74c75c4f839 SHA-256: 00bd41dc919cc5afb58e72b1d054e407e5ff93f53c4bdb635c7cad158872de1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to domains that appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates a payment-related lure, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vivaldiskibus.com/FileData/ckfinder/files/20210714_619D95C7D39C9891.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a71429cae---fenulepuwewuxugadimixa.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/8432174331.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad8c3f2ac9---82352897635.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/lavigijekiwoluluxif.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/72969974754.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/32506253970.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gu32br4pqbopnin6ijn182jlhm/semimibabomag.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5cfe024ebe784a66529e0f89f97db62e/80178039097.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/652614bf55eb0661445be27628e9a046/jaloramegodubeguroxex.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f74d0acee15---duzuterobifuwasiwebiw.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9200ceb6---74122047282.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/91552475710.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/7977917679.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/70815701610.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/46079435485.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jexigepafila.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b32dcd0ed202a97d5025e246e5796c52/18899756000.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5c3febb8c718c57a8d2b0688d171759e/54943609775.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb49b898a2---88669355466.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c7b300a3900ae857604115fd2a6f20b/resomugiteludetoton.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/49844863795.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vopagiraka.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/73333396415.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/60738045682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=learners+license+test+pdf+downloadPDF 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_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 18004 bytes
SHA-256: 945b145d511f59941b1caa5f5e48d77f959386b59c986aeeaa84bdf7ecba3f9f
font_01_sfnt_off0001325e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 10656 bytes
SHA-256: 4ca8afd92ee3981a9a64ad71183985e23c092e2e251b20d23181920cffa76d4f

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