Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb11ce26717cb05…

MALICIOUS

PDF

83.6 KB Created: 2021-10-04 18:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d8f4e4ea75044a70a5b4d678dcaf566c SHA-1: 89fa4eba5321855cff1ef45871feb483ec26170f SHA-256: bfb11ce26717cb05620df754ed4d1115bc4cf4ddb18e787e6b334126dd4f43ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vidol.nl/userfiles/file/65377157087.pdf In PDF document text
    • http://sattosushi.com/uploads/files/83006151503.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/26966124455.pdfIn PDF document text
    • http://nktrading.qa/file/files/japaju.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2uesg91eou0aeomb3euihl5f9u/54757434579.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/1651465423.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/bafiwenazelolinuk.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d7eee596---fiwilesiforizosi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/doginidudegufawom.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/tabujimubofigono.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0b87b0787accb387e24e56daeaa7d2da/figetegapodujeguxuxi.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/xafokorani.pdfIn PDF document text
    • http://jadeite.ru/images/file/87519944098.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/51585683774.pdfIn PDF document text
    • http://okvin.org/userfiles/file/letazomazibatebez.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7d9c0b7c2---80237727510.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615adf4d66583---mapaxudalaturomuxefa.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/26735957909.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/jenuza.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615339029fdbe---fatogarozopof.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/xaretidulok.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/90517848904.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kemegimusodizif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=restful+web+services+interview+questions+for+4+years+experiencePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/28953156010.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 16860 bytes
SHA-256: f8fef6eefcd8beab995aab9a7c9a8dab3647ca1a2a7a88685684cb2f35e0a4b9
font_02_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 11348 bytes
SHA-256: 1d4d76123e55f95bdfe6b1d222711d075d6afc10169cf7c43cd631d4e113d640

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