Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b375e17b8b31e7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 03:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 419c8978d375ac2f02d361bab1dbc04f SHA-1: fded6ebba192f42744a010b70686a8b22fad19ea SHA-256: 91b375e17b8b31e7c3d5c821b73dcbb491bbd36f0a779934ccc5696db97a2b92
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://whatifitspossible.com/ckfinder/userfiles/files/ruxefanozepudunere.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8ccd67dfd7b5a116270f6ac294c5e2fa/90381247963.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210902_F8DE780FADFC9943.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/soribumexuj.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/35821894169.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/frmgeesasn5cpnat7lqmkja531/11158786547.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614147a158dc4---jitosapulolozabeloxalejo.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/9512539643.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/66772778181.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/39841808086.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/dukogi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142013998496---munakudi.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/39636830557.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/pesebotofagaxukovovupexox.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441ef713710---63791134592.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/bojotajipekapuzit.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/68150274066.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/tozolazo.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/53652207148.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/mafeluzizalupab.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/67310167192.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/16870871791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=apn+settings+meaningPDF 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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 10312 bytes
SHA-256: 42f79ab2b95eaa2f87f70129a6e05f9089fbbfac90c966fa9ade6289ba5ea899
font_02_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 18288 bytes
SHA-256: 0e1a415160b276330cccc588f02490003361a060fcf57f54563dbd8ea522c742

Open this report in the interactive analyzer, or submit your own file for analysis.