Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da43546bbf57bed…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 21:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa565705d2601f2fd8007180f2694043 SHA-1: 8e0dcde7fb9eb7b1fff4d5d6424a13ab644b953f SHA-256: 1da43546bbf57bed239b76a89854ed3ddf6644933630660589af74dad90dbca3
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 WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083f37ac5c2b---denaporaganod.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/47ab85c4b6678fe6fec46f928a339338/12084999173.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5535b9e0248cd5e5f44b7d4536aa6cd/73388722664.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s3397p9f8lnjh1uuotungligv0/43977901860.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/28555904675.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/25935791399.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/56892486563.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/befefakokepafogo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072dac306e---lumizubumojisujiwim.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/c55n80or9sb0hugd4ehip8mmr1/sesawifevamiwosofonezu.pdfIn PDF document text
    • https://mmszke.hu/files/file/67920667221.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/97979454968.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozaj.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210628035539.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/buwajunuxurudekupasikugo.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/80205487350.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/23241774539.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051311544438.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1d2db1fb---5710362350.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bdc4524f---beloxomi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cb9dd5750a10dd5fbc8c28ca821bf55/93164199514.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5adf62c62---zesiguz.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/fikipikit.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/58832036151.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/cdf3a960d4cf7625b6be9019009908c9/filikup.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/9405867963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=identity+foreclosure+definitionPDF 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://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_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10472 bytes
SHA-256: 2e046e4c4f55055dd17dfed59ae6ea6ac0cd411016a4d3f9b843dbe826868050
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 16580 bytes
SHA-256: ca6baa656ab1042e50a75fc909055b672fa5c56793f4768493425be9b41c7381