Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b033bd531a654fb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 19:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5397d180159a57d07df98ff9f55bd55c SHA-1: 06eaaefd2669c2902f53d27f6d4da0e44314d27c SHA-256: 7b033bd531a654fb841125cf41c51c4081b4fd2ee431dcb4962e5718db2aa906
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several heuristics indicate that these links are distributed across disposable hosting or compromised CMS uploads, suggesting an attempt to lure users to malicious destinations. The presence of a 'utm_term' parameter in one URL further suggests a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://iucecb.com/files/file/7590383814.pdf In PDF document text
    • http://palami.by/images/file/30698380847.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/xedexutavo.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vinazozepipumabunexi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/fajazafipar.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/xaderafuzesufapenaxon.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/gukivapiloxaxafekaxanuli.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/xaduzobon.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/80282571641.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/xasaxevuzovizi.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/folitulegelijowirade.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/laroto.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb70094b6---76227976350.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/63857979797.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sozenilasoruliwaga.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/siminejelumipotikove.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wisonewose.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d1374cefe9dc3e9d81fcf1caf1cb29b9/rifijufipogapevegilexabef.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/solusapozosonozeleba.pdfIn PDF document text
    • http://partnercable.hu/files/jokanozin.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ejbkguuu2eekqthrap537l9n26/lebabu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/19782866662.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/tifuposutitaxusakokesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dual+speaker+mod+apkPDF 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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 17836 bytes
SHA-256: 3a38fc2efdfc47f104e70701a17b3cbe0afa9a3d1f904c4b08711c4231dfc60d
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10452 bytes
SHA-256: 7fa5864c4c51a53df18f1f511a0335cf2e20f61d60e45edceef66d2982647013
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1