Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2406fa13fdf2712…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 09:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2bdc07c030686411b040d349e14ad77 SHA-1: 26fde2057e78ec9f79f6b0d5e997efbdd91a2980 SHA-256: b2406fa13fdf2712a2829a40e74d1d6751fb4abe953bd21ce5bd45762f2fcceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=holy+spirit+i+love+you+lord PDF link annotation
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607449bb2c662---jobifibaxexurumes.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a591500691e95b844969cdcf85562b83/zexoj.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/27789858697.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/posenaj.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ef40623f---limusorizafe.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1b8d2f3u2pkqgnfh41vj3qpbtv/javituvofasogubozuserur.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-2/20210702062048781364.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c88c7062013a4b5ddb67c613bd616601/misimomepesufusob.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9621bd8b92ba5415d9ff7874fedbaa9e/momaganenowaw.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/52320811340.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54776379870.pdfIn PDF document text
    • https://wita.lt/images/files/55911454803.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nibofunomopatogomut.pdfIn PDF document text
    • https://morabia.fi/images/file/rozeselisugenede.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/3789580426.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bilimigigeb.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65396106744.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853a873de79---51630013329.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/81482740599.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/diwikoluxepikomiravefuro.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/16763431757.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/vewixufodepexenirupi.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/78424702500.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/97016119811.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_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 10388 bytes
SHA-256: 3380722f06e04dc8e9998968e68da489b3fa9229310526f9307fc5ce71234dd7
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 20164 bytes
SHA-256: a100b395870eae667a6a8c06890e44c40031d1d90d7b762cf42fb961e3c35716
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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