Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb00f97c8823a8d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24084cc2d9b117cc4f6a0983e3cb2839 SHA-1: 2209fd5cc593789ef3176678a6f24bdd5d4a9223 SHA-256: 3fb00f97c8823a8d1c96acc6cc1391d2f5016915279c846f155c02d99916787c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary goal appears to be redirecting users to these sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6fefbba6784bb7437bc1c04101a938cf/lukapexuwul.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51bd75bd93fe3feb2ae21f671ce96ad5/kebirovoxujufulofor.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/zefolesuwuvofojunubuxe.pdfIn PDF document text
    • https://hssanesteban.cl/files/gariwegujufabega.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hck5lqur3q9m8m7vck8gjj1alj/marutudukiladuxokozepusu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611827f9575ce---xevetusejugonanesi.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/wumagibusesaxut.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rloaeeablvkgcifivdhr53inl1/takinepowukew.pdfIn PDF document text
    • https://emenu.hu/editor_up/kizirofokivekowadok.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c16e49ca681---21110611418.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ead8697ab---telofasevugorivav.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210617033845.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085174ada1f2---51174729310.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/68a0ac612537a7b2d0fa4609026fde2f/kifojeviluli.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/48537457712.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/94145956622.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/fazipalikeramute.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce52314e57---55027776617.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3926855dfcad1b80ab5ea36d5613a867/dazodupefezowovakez.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/58949461940.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41190c84b6---dizesesufajos.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/duteruwimokejetilubix.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035ac71bfc---natibefetezibanunegutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=referat+glaukoma+sekunder+pdfPDF 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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 18380 bytes
SHA-256: 7629d86395eb79d04cbdfc374c434f5877f64a096eef4f5600a5cb14bb301213
font_01_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 10988 bytes
SHA-256: b0252154606c7436ae9472e845bc6eb3a13f00b12eb434e3bcebfe36fc008609
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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