Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c587c315b6b5f2…

MALICIOUS

PDF

148.1 KB Created: 2021-08-19 09:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1539f58a35dcaf38c4ef57a7b0ba8118 SHA-1: 6400d9a2601a373e766611ee9d8cbffcabaad639 SHA-256: 71c587c315b6b5f2e518a62620767f65dd19a7488b42c8f4976f2b46f9c57eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting a link farm used for distributing malicious content. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa202198ec---xugapokogitutudomopakoxob.pdf In PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/93692930197.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vebagabog.pdfIn PDF document text
    • http://chromoink.com/updates/file/rozorobur.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/taliroz.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/59431729206.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80b6d8c74---tuwubineruledevujimibosik.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/kixixegejomunewununat.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/30724067693.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/kogefesukowomix.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/fupepopafile.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/68646005484.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/65974658445.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/98825076359.pdfIn PDF document text
    • http://www.celso.org/download/90970290639.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/47f6013ec9113aa5793b6bb3d933a032/vebuzilimeronoso.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cb65960---kepebakovegu.pdfIn PDF document text
    • http://dhf-china.com/d/files/96000243579.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d9e3622b---50013400074.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b1775344---zifagovirowum.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bapobukuzubodimade.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01db21e0c---rugekewiwibufe.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/siwuxufovepokiniwixemob.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lemafoxapi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c7fd36dd5---berewofer.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c6dce914bf9d3ad8588b2acadf966818/37557827745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=derecho+administrativo+1er+curso+rafael+martinez+morales+pdf+sexta+edicionPDF 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_off0001d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D918 11264 bytes
SHA-256: 46719147ad9d45d5344095b2ec214d3e408a1c59035219dea2f133f29b94f035
font_01_sfnt_off0001f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B8D 20316 bytes
SHA-256: 60f61e3b3a063aa70e43ba57d0e520623d410496f07aa443e9c22cf668793923

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