Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb9fc2fb8105f3b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 09:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6d4b47735af19a0cef2774373d94233 SHA-1: 6de0af275d68f18f17cc4d403abdbbe03a2e06f1 SHA-256: 9fb9fc2fb8105f3bf0fc3df4971eb6ec2ab08d22bfa0b96de806fd22bf2272fc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://istanbularicilikfestivali.com/upload/ckfinder/files/zusavapoleruwoxajuveken.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b90e67c8---37959661806.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/96964862609.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/49815877233.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/11947116290.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zonirisabawomesedur.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/bunefivivigiru.pdfIn PDF document text
    • http://firegallery.ru/img/upload/powuturunofawefamitikusaf.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/54640hmtdi0q47flvv74j1rm3n/64101604576.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e412242ead---66312980453.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cb3ad054---zosofow.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a24f2da873122ac1c671a28e3bfc23c7/69311655952.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xagilubolomugebe.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4495b4c5d5---7930632898.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/14513250281.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/widokopabojukijixovazi.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/84463121309.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7c2bba59281a3e20254e04e709cdd7f3/zemosasalese.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/zixusu.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/33623114951.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/14597214602.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4b654897d9f3ea639599fc852d16ee07/jajenip.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9aa3f7473a1603b6d0350c672ed1e5ef/37207527967.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/93827838594.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1d708c497---figowusogateja.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/50264502934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=word+to+pdf+software+for+office+2007PDF 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_off0000b899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 10836 bytes
SHA-256: 34b832a04ed513cff8981f21c9d901689f41c92236b1e1929d8f35fed35935d5
font_02_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 16028 bytes
SHA-256: 8b6959729a5b03bca35bb0e6d94d15d39416eac7f243fd57b9ac4ac6cae89dfb

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