Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae3f884ad08c0c2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 01:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9730b496be4c670ab387fc37895da974 SHA-1: f90e8fd7c434a819a59918cdcec383e00c48dede SHA-256: eae3f884ad08c0c2c69c32ed7b693f7c275338253180e7b82e05b2daa59da72e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f60c67c08---55623366955.pdf In PDF document text
    • https://systematix.pl/userfiles/file/51934394320.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kawojiramifam.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/vabofudububer.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139814550554---15381995114.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/pokidovufarimonigofakobiv.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbbd60cf2---57172655836.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/84407237008.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zisigarozitazis.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/nipasonuzerukonudodobob.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/20251362024.pdfIn PDF document text
    • https://pmms-online.com/assets/file/16813701746.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/11368935419.pdfIn PDF document text
    • http://livestocktool.com/d/files/wujokegirodu.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/1647066412.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/jakujugugikazunife.pdfIn PDF document text
    • http://analhospital.net/file/files/xusifopebixolim.pdfIn PDF document text
    • http://clingac.com/d/files/46140392381.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/60770864510.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jugowupukaduxop.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/09111bf771e15afb3aefc481ad311d01/95549552222.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/47370272662.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/88391982665.pdfIn PDF document text
    • https://novitas.ro/files/86369087616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+best+free+movie+app+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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 17784 bytes
SHA-256: e71a33d8de137d931f4794e06100a5ce8dc0260cfc036bd67a5d88595305dbc9
font_01_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322D 10888 bytes
SHA-256: d3db1716ba746e23acd2fb68ed3695bfa9d0de1291f5fff611c8b4ecafbc74d8

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