Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d339377f26175a4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 08:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f35ee2daed6f3f00f2fd21b50f02dac SHA-1: ffb46ea9415c02da4ee2b0f725e8db9d0b7cad55 SHA-256: 2d339377f26175a464ab0cfb5546173ac76b7af8eac9e3bc9294758167673c92
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, pointing to a link farm strategy. The embedded URLs suggest the document is designed to redirect users to potentially compromised or malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=adult+apk+android+games PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614114fc781ef---lebukimulisekafebuka.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210911113756883904w63u7z.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/jusavakegubeliveludigid.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/32769382462.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb091c44d---ledowavixusopadis.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/rarexewavumowijivudibawe.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/42314235391.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320093b2b2a---sonedomusaxogo.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/66377460528.pdfIn PDF document text
    • https://vendax.ro/files/file/jijegokadomexofisaxifi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/85899787455.pdfIn PDF document text
    • http://gekon.net/userfiles/file/32164689690.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/31292505345.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a6b8831b---33270712111.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/21356750955.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tugubapulomarunixite.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/65788129080.pdfIn PDF document text
    • https://goodline.by/userfiles/file/govinejokenesawidil.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210902231642.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/temozusokoguwukufat.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r1rpjai4b31j2v8d0ogobqimu6/95474434878.pdfIn PDF document text
    • http://nemochem.cn/upload/files/75853656742.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911135508329052137.pdfIn PDF document text
    • http://cpviettin.com/upload/files/nizevolimunebipipuf.pdfIn PDF document text
    • 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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 16644 bytes
SHA-256: 174edca452c5120df9393455f35dad6fbcf2456387b5b42d81dc6b5fcaf36d9f
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10908 bytes
SHA-256: ac8291a914477e156e411a9d71541e244bb6662904da6e1a74242914eea9260a
font_02_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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