Malicious PDF — malware analysis report

Static analysis result for SHA-256 def3d777e7f76944…

MALICIOUS

PDF

91.1 KB Created: 2021-07-07 06:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32773b198d7b8d81075492480c774bd5 SHA-1: 1cac41f920801027a163c74c31f8874e86d1c835 SHA-256: def3d777e7f76944564974c271ee7ec2a0784fde3ce82d51d595945a0f4466d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious content via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://renesens21.com/ressources/upload/files/20752186087.pdf In PDF document text
    • http://tcihk.com/userfiles/xuvodatevivojewolatumef.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1e082fe4---99321081909.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dajaliritetavig.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fqfcfe5bvfa3us53jlagj5tqdn/pofujanozajimikanobutezi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8c4a80778879f0c63030647a54203057/82723742270.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/622126b5a4e6d4bb6295cdf9fe60f574/98860621777.pdfIn PDF document text
    • http://iccarrentals.com/files/file/porijajitimexerarijutuxu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2da27fb11f8a1e576ba1819ee7ce4416/81622180133.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/guwijipowelupit.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936eabec120---83902507379.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/492a858f058e8c517ae50fd4ad4faf79/50348494150.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/eeb4dd4ddce39bd1e03c6909b11a0a5a/xitodogoxaxurizagozoni.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1d28b970ca25430e49fe8c86fae2d9a4/3718799819.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g4h3k9ovpd5q5arkd6qen9fv21/kikifekanimekitivifor.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/fixenadixig.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b12f122e2e4---76637513614.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a050405136---joridoruvos.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea210fa41---31364488061.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3d916e83---joporamopobipujinovutu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66070156b1---xorufulewixinitig.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5fa5on830bs65b102ojo8a374l/baworapuzuvepabuxonukik.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/39303970504.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629212537.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/garavoketamuvepek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=assassination+classroom+movie+365+days+release+datePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 11168 bytes
SHA-256: 2b4ef3d3415983fd6eaf4c33211eba31b4798d6d65c964fb71b4c412a4530d81
font_02_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 18516 bytes
SHA-256: fb3651c2d0b968fac7226468ff4e150ae42ad9dbc8d4f275fa62b90e41ea7986
font_03_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 5492 bytes
SHA-256: 861248a20772dbdb5edd18d7006445ace9705f76a8490abc3d821f14bb4d3f9a

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