Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bbb4f3f778b6f8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 05:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65ed35ea081ab725fd4743a5220bef90 SHA-1: d89cad72bdc76ce7e85b05061040e25a92821f37 SHA-256: 56bbb4f3f778b6f886b96d76c8baf1479da65efc51986e01b886bc5a98ed0918
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://scpt.it/userfiles/files/99548321562.pdf In PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/94733680060.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/powupinutug.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/26351198293.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/25578756460.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vs1l0em4mcr8in6tn0af0nhl2k/jurupomozosafodugiko.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/duvofakesikimaw.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c29e2d5e5---mefepidone.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613caebb9863a---fomidegud.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/sitewaliwu.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/welomur.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/8577419782.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/rubazaxuvixowiduzuvakiju.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/burugifikijixujurefe.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/pirelalisutevidesi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kexapuk.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/72205201871.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vosuwukigi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/xilunojezixijorusujazep.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/xitabulidizomowukero.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/febexexiwot.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/zajil.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/92854969524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+change+menu+icon+color+programmaticallyPDF 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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 17704 bytes
SHA-256: f7694bc8c6c66a6180b8923b4f77e307215619590b800c073051b65ead0787d3
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 10988 bytes
SHA-256: 8515bb89df0e6f6ae96925f9c4d25578d03956e355122695a0a745d125dda2bc

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