Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb40fd143857368e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 04:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1d8eac2c7d2283765d3d733174c987a SHA-1: d86722c6ea338be369ecf01e90ce8cd7836a25a0 SHA-256: bb40fd143857368e80de78239c4f32bda6ebd80b23ff8dbe5db117977533ff2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of a 'utm_term=cash+app+gift+card+generator' parameter in one URL suggests a potential phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chiangmaicharmingtravel.com/ckfinder/userfiles/files/45313882136.pdf In PDF document text
    • http://autoklej.pl/app/webroot/media/files/9226516041.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/ralijosexomupo.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/viguvirolovomin.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30b4a80ff---81973987163.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/18167825317.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/gatewatuxisinimijilof.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e6626eb---fifij.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/56201060008.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/donuxetaboweki.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/45e3f57c7ed8032279c6a90d9c12aa97/duxaxirasabetom.pdfIn PDF document text
    • https://ccskin.com/geektic/files/43252306671.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/26384999788.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/fapejewabezil.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161380ef4633d7---33559049279.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/nejamonisiropo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b76a3d61a---fijuzetanodetip.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/mudakonev.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfb863ecb---zumet.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/semofatoma.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/14930378984.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/gutuwafebunivigitivawaba.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecd6e482ac---4490386068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cash+app+gift+card+generatorPDF 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_off0000b436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 17232 bytes
SHA-256: be20989d07b843dd95672a3d505779a7d1086902053840a69b90c0613b373401
font_02_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 10884 bytes
SHA-256: a52958b2aed1433a8bb8267f8796d657bc5a2c29e5f8350da252cb56666e9b6f