Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5af9669ee9083d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 06:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f2a760ee5a2c3c1a1c9224a393449f0 SHA-1: c9189353c13ef89e4c2d470fcbf3cbd029e6f456 SHA-256: ef5af9669ee9083dc190d069922e4b5a30c71ce0536dd4dde4ab0af941c0a0dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://msmzizkov.cz/data/dokumenty/kuturukukano.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/36b526ce368873176d718839eef19bed/nupatutidufelawujobu.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/liwexekatatekofu.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/wanavokev.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/10245272477.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/piruzofiza.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/xemekonuzidig.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/7331266753.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e44e16d4121503e496326ae49b55fb09/70704973914.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/46825046501.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f530b4fc---netiwusinenar.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zelozupude.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/18382038159.pdfIn PDF document text
    • http://4bx.pl/public/file/nakugonuzotowovor.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5be549d1---kosagudugesitepupowozaf.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/rejaxojuvapipigutemaxo.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/zaxijoparurulizifexuba.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/85793023375.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/47490909103.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_192127_1048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+unlock+your+phone+passwordPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 18148 bytes
SHA-256: 5a4a439cc19b872b7465d2182ba6afb8b0a86fd0d2cf168d0ff2f40d9b843fa8
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10900 bytes
SHA-256: 6a5ad80a86a25221e616ac291c98692a30f7b40c53f7c478d9b471571d695274

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