Malicious PDF — malware analysis report

Static analysis result for SHA-256 49410612730b4677…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 12:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 495f78dbf36ed3cab4df4a197be0154a SHA-1: 9b844bf8baa2eec7494752ad17602cc513701e03 SHA-256: 49410612730b46777772cbd777d171a1a4534e2b3abc2985f8bf1e7bfe3e18fb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to potentially harmful content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094015fc06e1---66800907341.pdf In PDF document text
    • http://bronia.org/userfiles/file/1562674821.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/48752300109.pdfIn PDF document text
    • http://ilkemymm.com/image/files/88845510566.pdfIn PDF document text
    • http://feminella.ro/upload/fck/butuzurukitid.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062418534812.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ff9bee47cc7ccef4a7a48a5827ce55e6/66706798281.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/1456524114.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/sixewuvufuvurafa.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/79052643255.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88fda6c13f---28483040764.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/xemet.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/36378049224.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/vurites.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/retuxexekanalomu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be981d4356d66f66ea434f2fe63fb1dd/nuwevijati.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/48920247605.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210816_184651.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/13763277002.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/483439900.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733bb6b2edd---robunemelakakod.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0109f10a---55768683722.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u5ajmd3849n56tjv03gjhd4j86/wikimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oil+circuit+breaker+working+principle+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_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 11072 bytes
SHA-256: 6e8347e91be0a1b33c42627b4a9e55119843b839d481e2a69f96457cc40ea019
font_01_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 17532 bytes
SHA-256: 7b026ac9999fcaae9ff4379a9de356c2c5887576a3abb8fa121f8d33d19a489c
font_02_sfnt_off00015712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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