Malicious PDF — malware analysis report

Static analysis result for SHA-256 275624a35c126448…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 02:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baba34e815c37982c5451b658aea729a SHA-1: ed535fbbcaff8bb1d4c5606f662a4cfeadb8fb1f SHA-256: 275624a35c126448f0863a7a97cced7f183191da56acc90da23f050bd7f09db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. This suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/81973448592.pdf In PDF document text
    • https://granitabrasive.ro/editor_up/95008739918.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082e2ce790---33494315959.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/97597778688.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f7575dc6e8b477b7ce742456b46dc414/vokewofenolorivonirewubi.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/vabulagigatowipu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/86600747569.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9a173136ff522559da72581aa5bfc336/43187049344.pdfIn PDF document text
    • http://abwrva.com/uploads/files/jujaguzigofivetelisexa.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613511b61e649---96215181534.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/xemar.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/71586117440.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/92865016861.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/92161088089.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc4098eb2---fajosinarazajabo.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/famotebado.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/69515647198.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/58044586174.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/88004990512.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/savozijul.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/potivowibuxojakejalukivam.pdfIn PDF document text
    • https://reniuved.it/file/xilev.pdfIn PDF document text
    • http://juraganmonyet.com/contents/files/69404393571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+android+2.2PDF 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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 18640 bytes
SHA-256: 81b68c1b4e9c4deb9e3a3c2bb1634a8383964258188de49d3239f04ca249fa7b
font_01_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 10116 bytes
SHA-256: 829024882d3ce7c72e8f1f4e36991411aaf0bbafbb582436ee4f6c155899a788

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