Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a50557d24151599…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 18:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec992448c17a7ac2fbb1bfe59ef048a5 SHA-1: 18f13871b9c51661467bcad2a2d0f4137c28f160 SHA-256: 8a50557d241515997f649bfd00a8bee66ed6be93b2943b33d09f7df200c0df27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://telewebmarketing.com/FCKeditor/file/xidixoredefulusupimav.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d0521a9878cd0e0a3ed07dd51ab199d5/20981785911.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fd7fc6804ac558da50fa8760062a7bbd/bumot.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/64314838623.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/turolafikubo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/33851939421.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/34995326472.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/aa1e5f016510faf030c78b1bd3991b58/19621476778.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210911_95BFF28FC80A107A.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2mhbtre53d0aehpa8rot38ptf8/56974879631.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/26990336573.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bulizopurokirerefikega.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/99238292918.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/15130963054.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09c2838a5---97748302984.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/logob.pdfIn PDF document text
    • http://cochemical.com/upload/files/74612102195.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/55809983665.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960f57016c---gegagigamajifi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d76af429---87154901919.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912035554.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630766731.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/98774073332.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/tajujiroxajolojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gothic+wallpapers+for+androidPDF 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_off0000baaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAA 16868 bytes
SHA-256: a75a0d57e7255c218a8d0c2b34573cbffbfc590236f06ad095bc093387129fdb
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 10844 bytes
SHA-256: cc16ad56dc41d6acbe0be6da27ae723635ca97505df05c6fb2e84fc0961eb2f0
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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