Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b6e8b78399b5c7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 11:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6c8ad339448036bb01ab3dd37e7411d SHA-1: f73dfbcdccff22725ab1ce17eed197be71ca9e3c SHA-256: 24b6e8b78399b5c78ee47bdb85ecd4aad429e4fd866c5ada3d6a732ec2b77236
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be redirecting users through a series of links, likely to a phishing page or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=read+call+me+by+your+name+online+free PDF link annotation
    • http://slxiang.com/v15/Upload/file/202198112567275.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/55530607578.pdfIn PDF document text
    • http://clickvay.com/upload/files/newirilaru.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/zewalovozazofe.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xewofusisuzulirexu.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/98628950273.pdfIn PDF document text
    • https://noddy.nu/images/file/16818150772.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/mixutexonujilolu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/xevomiroraluzaluwusi.pdfIn PDF document text
    • https://dalba.net/other_files/File/lizoxazukixedab.pdfIn PDF document text
    • http://epicridesnepal.com/files/nogimajokalowu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/51737311753.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8aee84aa---82224793480.pdfIn PDF document text
    • https://bak.vn/upload/files/siwexibodijuzejibeti.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/kivumapimodefufavoze.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/lomexurasofobazevukix.pdfIn PDF document text
    • http://ewtch.com/upload/files/40926937693.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/90836580713.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9aed8350---guxol.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/58412270619.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/77461870058.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/tovoduropa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4e188ea0679a57512788b5aef8e91671/dopetusumolefu.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/72220086778.pdfIn PDF document text
    • 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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10768 bytes
SHA-256: 93dc7b7b7af5df8888e52c1398cd214dee0aee96592ce4e4292cb17d559663a9
font_02_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 17244 bytes
SHA-256: 08cdfef8fdd5ab4d5e58e6be8a182bfa1c3d36bed60c5bc592d09d56b15f10f1

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