Malicious PDF — malware analysis report

Static analysis result for SHA-256 e372a5f6c8ce059a…

MALICIOUS

PDF

85.1 KB Created: 2021-07-17 22:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69f32fbc6354c5ba8b7a458456c6ec13 SHA-1: 3db33de4fae56aa2770dfbb5dae7701d39da5443 SHA-256: e372a5f6c8ce059ac1b1ef73503c55fb255a1f672e0bec90eb33042c7eced1b7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smn68.com/clients/75339/File/52126001993.pdf In PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/a8a8abcf8eb1a8bf9ed7672ccde60fa3/xinukukizulokar.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/29522493107.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/146d4c2970f7c441b32b87f99d20fbc5/bedavoregipezanurejika.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccaf94b25---67503415864.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/lasonozevoxibeben.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/tejomupil.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb00001275---goxigikonoma.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mkttaoa4q0bbsj8b5030p3dq01/dadunip.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/l9ra3j0669ff3to3gd9lv7k3ga/85280076833.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0bab6b26---korutevimemuvemowixegoguw.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/96320888766.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/xekujufoxanazegul.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f9e25425bd020fd556240da25f19bfb5/gejipafizal.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3e650d10a59e7f1c5f4041c91df62ce4/25597430383.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/86571824129.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d55ae2bf---kulosusogor.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda43315237---22802056677.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ff60d68e---gotijepawajurul.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/17192600692.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k98g8h4l5qlr0v1mtliknkii30/xemadenenaxumowajuxogef.pdfIn PDF document text
    • https://digireg.org/upload/pefemulorekadasa.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tujisipewejepidifeletu.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a108de095b5---zunevokufilokiriga.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/6685159594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=inositol+in+coffeePDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 10020 bytes
SHA-256: fda37deaa99647b6914280edcbb934bbd84973b2ca5e9a3a67ac717dbe34d0e3
font_02_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16744 bytes
SHA-256: ea7a9daf503c1c6deabb903409b38637e0fb8260d73cbb0b33b3cb0b9314c0fc

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