Malicious PDF — malware analysis report

Static analysis result for SHA-256 913f8589aace880d…

MALICIOUS

PDF

87.3 KB Created: 2021-07-22 23:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fb1a50f4e01d14f5463365c19dcb44dd SHA-1: 40866aa0b70eac7b7aa651919226bd97a985396e SHA-256: 913f8589aace880d986335163988bf7fdf1d6b8e10b349fd56f9396e20e54d67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29a029b66c339eb3411fea7dcc3e08c/nipamobamogoviwumotisur.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fagisufamekibunurunenigo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b341993580398bfba001447b51bbe7ab/32358348109.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2aa2092fe0b95ee74bfa4534cb4d8094/82709385268.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/20514283685.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e43554d6a45---bozimobi.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/ruvigar.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/kusajumire.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c95bb954239---jefugatumevoxenosexi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3115639156---46905682585.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/faregivafilezefapemovil.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609395b281662---dinovugisuzegaje.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099be2614c22---38552885016.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e981e570c---fipusoweduwikumelisavub.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7413cecbf5---vefazadisogujikukile.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839fc262b72---34009569338.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/46839171782.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/witexuziwudedefelowaxej.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/46138811561.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cca87cfe---60423313748.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/65780544105.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9b17472e---sovosox.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/33712331345.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/87414040071.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bfd2c95e08376493429044a25ba5fb28/15674863072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=physical+science+grade+11+2020PDF 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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 10840 bytes
SHA-256: b2d9af387ba6692ead3ef650efce8cb2b24c8030a2eac1bffb8b4a621b9ba501
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16788 bytes
SHA-256: 77bc25264753f63fa1291e898c50c08455eb5647139c51e34a32637ebe050131
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1