Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadf0c2aad9218cd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 18:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 723c68e22357e33c8fc83cb5f980bcc2 SHA-1: 384d2359772d522c205573c5ef4da38c389917da SHA-256: eadf0c2aad9218cde50e79487236541e545c82dabfd4ec280cd8faf95b54cbcb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/doborane.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/1631220493566983428.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/jugogofagarirofigiban.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/5580442334.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/80619055924.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090203313618.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc7af0b7a---95353364931.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f1d50963b---50511606500.pdfIn PDF document text
    • http://online-cycling.com/files/file/sipakefodedekefavore.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/42038098813.pdfIn PDF document text
    • https://renetravel.ro/images/files/muvowepifumix.pdfIn PDF document text
    • https://emprenderem.cl/files/memovinotel.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/farafiwaxeruguvakevonom.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/88038033115.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138472106b16---xinulesowi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/42297046912.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/sowuxi.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bigokudajakoxuwonij.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/mukomikivedagegaguvemot.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/boverorigumitimiwizi.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/99243329516.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/jugesorojot.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90187056267.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b057468c1c0eab1c9173556e257d4500/retikobilikegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=powerpoint+vba+tutorial+pdfPDF 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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 17188 bytes
SHA-256: 009d6d481c0f70f7422670fe87062777d86e02876f38c33594a6560b4c825056
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10716 bytes
SHA-256: 06c3358836cfeb9e38a73993c36d86b3c9792c16ca081e8e3a314f68b7fb112a
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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