Malicious PDF — malware analysis report

Static analysis result for SHA-256 153a3b3a319fab49…

MALICIOUS

PDF

93.6 KB Created: 2021-08-20 08:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33a314474692b2b84cac5e6d70f84cb2 SHA-1: 82f6272fb3bf9990ef8a9b56c776cd94358da718 SHA-256: 153a3b3a319fab495ceeafb6600ad07ca115e0e0fd28b2ddfbaa7913c86d4835
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded JavaScript and external links indicates a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a70f976ed810ef9d85e3ecd3afc2cd37/dorawogizawi.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160766cd1a6b6f---bivuserenoxuveto.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/gimetazaja.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9c5e36fbfbdd5f66db11e43beba18adb/81006858633.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63754718d---43560474449.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/xilomomotowekurezunaz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609927df3eeec---78394435804.pdfIn PDF document text
    • http://computerdoki.hu/user/file/75290934227.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/70963455512.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/54439016624.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084355b6fd5c---xakitulidorikokebenawo.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fugagikokosono.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160890dea4da96---soxoriki.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/53502103573.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01ed94d0f---vixemizuvuzejikulisopumi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7c2b7b96---90488262426.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/30991802658.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/likuwafo.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/wufikapowefirugipivot.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/bekasasar.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zipusuz.pdfIn PDF document text
    • https://nevisnews.com/userfiles/15163721435.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/lelofinipi.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1626203614.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/ginijatunezusoxuzofif.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bndu5hrh92taf7pu9uimpla473/68599526570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=do+milk+frothers+heat+up+milkPDF 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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 19860 bytes
SHA-256: efc42eb7554d3388f58767c178eb40f3e614d80cda90ef02565387e03e6d8beb
font_01_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 10712 bytes
SHA-256: 7d3d54b48ed0a8208fe7289b7ea3f56561859eb04bd58e10a2be4ba27fc3c41d
font_02_sfnt_off0001500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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