Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec136d29eb40796…

MALICIOUS

PDF

152.9 KB Created: 2021-09-12 21:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15d6e7be9e83abf46bc9cb894b800b82 SHA-1: 724b782057ff9bdfd3d304ebe4a567a4b6eebfae SHA-256: 1ec136d29eb40796244a7534ea700268d09ab2935f8c78f7f9fcd1df863b4fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://linker-apps.com/files/bevep.pdf In PDF document text
    • https://allianztc.ro/files/file/65490252588.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5nmo1tabprhs9ogu5202setij5/22548308506.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/37573327738.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2d30b7f---lofusimujifojosepaligesop.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5db6bee82---56649228520.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa8f0ef66---13040010949.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/zatozowogepivebobipole.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4813fcf792451d8a00dab4d591cd4dc/91882681983.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/xudagezovoke.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202195124441.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/megogegudobuguma.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/93152174060.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/buliseviwoxojaret.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/44921890995.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/97252363249.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210906_E155D81A69373F4E.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bakasomuvemakigolinip.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/dizovifujuluxukekimed.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/zajozorafodufisasil.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fifumijujovikijojaxol.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/80993103617.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e396a7f---81600209961.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/7910103984.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/92652227792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=verbs+with+the+letter+rPDF 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_off0001f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21172 10016 bytes
SHA-256: af1fb5031b2320e0505436468990f80c2b4c6427d1feaa13e9bcf1ce375a6edc
font_02_sfnt_off000227d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227D9 17692 bytes
SHA-256: 0a11bb55bba1ec28825612b3eec437b07df8f7ea37819072545bcad1d7a3e4c2