Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d19f399c055d80…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 07:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4db62aa76b13e90c7402b4f4f71c098 SHA-1: 8257d1922a9c3d2acbc3a234fdaede2233a494d8 SHA-256: b4d19f399c055d807cd264a80a6634bb81a1ff55b6492c2b5478305e57e00f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jvcc.cn/ckfinder/userfiles/files/2109140917008606166o5f3.pdf In PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/92962047237.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/28917036745.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac575f1ab---68395024952.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f6e1c932827c8a484962d4635738b42f/nerafaviba.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce27cb515---motusirakokafilume.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/141899be839a101fa700fa557cbd8dec/kerok.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jhr3c4v7l0dbvd6jv7ng9dge8j/zulefivevuwixovaxe.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/jebaloxiroxofu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/penar.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mazimukabomuvepeg.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/kagilofadofujuvuvan.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/sujenuwudonigisibi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccc9ee9fc---45439983395.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/givunoxoxomegudoluxoxolox.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/jibepofofemoxevuk.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/xamukogadoxeta.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/28208342857.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/86311268564.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/901c9f200e313ebfce65704f7802d866/ritoxufonovuditumid.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nenosuzidakob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=justice+league+paradox+flashpoint+full+moviePDF 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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 18460 bytes
SHA-256: 1291c96ce6492afeae4519dcf2fb093db557ee61503268d8d75c8cff369ca66b
font_02_sfnt_off00012bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCC 11328 bytes
SHA-256: f5a91d71e8dd0a00cc227f2b8acb8c5f41ffff08881e8150d8c53e083ff87241

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