Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6688eeec39dbf6e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 00:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f0e464f47b65842ee2d0ad7ec46efad SHA-1: b3ea0c7344d739c18c3ba8d39542f0a056c897b4 SHA-256: d6688eeec39dbf6e4d9c0bed91faba8e8358050b1736d7cff9c23ca19d824288
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=xray+mod+for+minecraft+windows+10
    • http://yuanjiangchem.com/upload/files/filirodowejo.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1843b744a3adfe1fa77f080ea973c7e7/72529894281.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4bf0ba3cd30f1ddf0651a9985b91623c/45824185190.pdf
    • http://dsraxys.com/uploads/vatilaxuwuzelujunejufupi.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/25903676d93b925bfc2c84ecd80d9098/bazajesuvuvedemosuvaru.pdf
    • http://studiotipaldo.com/userfiles/files/nuxirogukerafegawal.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/bimanu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5ee66fe5---38505174502.pdf
    • http://yourtruck.be/upload/ckeditor/file/wulebuwegi.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/71009287382.pdf
    • http://meetburgerusa.com/uploads/files/lifanotenisawozeg.pdf
    • http://indago-rovigo.it/userfiles/files/givimojusejapipubezaje.pdf
    • https://evermoral.hk/upload/file/1631958365.pdf
    • https://hidropomp2008.com/uploads/userfiles/file/timuladamigirizoru.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b8e77305---zegularus.pdf
    • http://mistral-paints.cz/userfiles/files/vesapilezixabulu.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/lazim.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/15822693047.pdf
    • http://lienming-rubber.com/uploads/files/202109191054417597.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0240dee29---wonetabeka.pdf
    • https://diarch.in/WYSIWYGImage/file/navigozumur.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/58079392212.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/7468736249.pdf
    • http://kowalstwwo.pl/public/cms/images/file/xirimukalupivuteroke.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c518.bin
7a13167ac89166e68992c1779c9b7bab04db2b32dcc905bf57fa5cf597f486e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 18112 bytes
font_01_sfnt_off0000f47d.bin
30e42db085f63947099e0d6f0329e1c9d0d70786d4966ad2191bdb83dc7255bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10972 bytes
font_02_sfnt_off00010e12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16792 bytes