Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d441bcb27fdb943…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 10:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 287e3758bac2e27413c70d7580e1bbdb SHA-1: 4f6c566ea7bc10b5331cfc3b7576196e34a37dcf SHA-256: 8d441bcb27fdb94374c2180a04e45d8b26003ccf434945204dda26c6347548cf
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links, potentially leading to further malicious content or exploits.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/veturepinagunum.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/52e08a3052288bc37e49abc8acbe6663/dezixokosukosad.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcf2d320a---migubumevuku.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210618045829_aenlwg.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/83302804307.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nomurufafivusibi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610005a905087---poxisefudoj.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115e1994bc74---deneludur.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/mazorakegof.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2367825626.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/wibaditobilag.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/dorubatodasalelerozot.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80c9c5ae8f6c4f2f7e0ac98215f3dc6f/lojixozoninutekofutuzeni.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1e204bu45uvmlfue8ek4n5n246/14382025096.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/50977030898.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/65557216542.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ffe02aa98---kuzerelobobarifolu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i7jlirsrq6kiorv3656un2adff/vewitogerosesiva.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oern8g6tju4b3hg4jp5pfiep35/jogodezurunotakumul.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a48a645003a953fd09a67be226fd0664/kewukebemekuso.pdfIn PDF document text
    • http://rhondachem.com/d/files/89022248169.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9a5b55855---fubisajakupu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ccaddcbe---zinokipag.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jupedemezaduwosozak.pdfIn PDF document text
    • http://berbun.com/user_img/file/64439897722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cbse+class+10+social+science+question+paper+2018+solvedPDF 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_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 11492 bytes
SHA-256: 7596a63ec85510915e8c6246fa50c9e6dc0e2c7ea657742654e20298b56a8feb
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 17164 bytes
SHA-256: 42147e0c0610876ef60179c5294dbe7551ac818311e061fba313f1728a65edf1

Open this report in the interactive analyzer, or submit your own file for analysis.