Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9705f3f30571717…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 01:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 567c3c9defe69697c02a517bf5693382 SHA-1: a266b3cc1d33d61f275a3d5d184d1068685a9414 SHA-256: a9705f3f30571717a8d12628f82d3e09f0a49330567b8d6887e00e17b7599d17
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the presence of numerous links and the heuristic firings strongly suggest a malicious intent to lead users to external, potentially harmful, resources.

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 https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9d623242378f71f8517b3fcba6c677cf/83233820004.pdf In PDF document text
    • https://dmshospital.com/mm_engg/files/4638093983.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/lobojigagagibud.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/96869652848.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/41119746186.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/74497755910.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/48853923968.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a45d2321f2---dukisemibefefuworuli.pdfIn PDF document text
    • http://progetec.org/userfiles/files/popetak.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/35502879917.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/lutuxifelixobekodarofi.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/jaxuxusimub.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/befugoxek.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090215524441.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/mebupa.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/tilazovafab.pdfIn PDF document text
    • http://school15-tyumen.ru/f/rejuxomodupo.pdfIn PDF document text
    • http://rafaelokazakov.com/file/misotasan.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/33433270069.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142a46ad7246---48816785149.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/39255612180.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vcdmprjf4la9vtric8d7k6aq9f/guxizarumijixipu.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/laxaxorugavuwobukemex.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lcd+43+inch+price+in+pakistanPDF 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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 10744 bytes
SHA-256: 081a90129a3def1e187a2319a15fba5ef19abed99ccebf1c54ea451fb21c61b5
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 19212 bytes
SHA-256: bab256a53fb3ddfa8b4bee07fdbeb8ad55dfea8da84e43874e1088ecea72e56b
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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