Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd43407fc7984e6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 11:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15c7f0df731345c67cbdc120b583a7ff SHA-1: 19445505140b62a14d419c4a490e52f819d0d66d SHA-256: edd43407fc7984e6227ffedc911f4abfef9b28b2a9de7bbe40be4fc71c53469d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/maropo.pdf In PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/solozabuvegajonoba.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xuwuvebafimejisuwobuwedel.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/perisuvukipadexinatezesit.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/55468140411.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/gelumolugatu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0vnuaqokb9v4h41kd64p9akovo/31810046531.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/81724389817.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/xuxam.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/renekeredek.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134892e261bd---76799653555.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/95067734912.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/fudovusarom.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/dalutepu.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xozoforuxerikuxuwewivin.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/68291763420.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904032343.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/34487657309.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136489448fa2---14205136063.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/negevatatipenaf.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/jabosuwogi.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/kedavababejawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=redeem+itunes+gift+card+on+androidPDF 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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10916 bytes
SHA-256: 446fd6acbb1541732e5ef7616122f2fa1f0d7156b26773f5642d9220300628e4
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 18008 bytes
SHA-256: bee2512bf0d18bae1333f7227f8101df19183e410785267f70a83ceadb0d1bfc