Malicious PDF — malware analysis report

Static analysis result for SHA-256 15131dd38bb00314…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6fe5034ceadfd8e28aae813a3dcc4f8 SHA-1: d2ce1cb047e5cfd8b99f93948abd57c06b580c4e SHA-256: 15131dd38bb00314fb1f3b7dc3eb79da4b0083956f8e3b3978fa9fcf6f076609
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=decreasing+a+pdf+file+size PDF link annotation
    • https://infrastone.com/userfiles/files/8301939906.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076ea712de17---13460116158.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625422302.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608617067f989---56188863444.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/guneneni.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/gelupixaworagelevizedar.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3a02aded---kuxirezefusibu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rsh3jlqhe0sujj3is101qcjclv/56651448947.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ro7guu5p8i2p22t6mac8ml7lvd/91647448616.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fawus.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c857cc6fe0f---dosemebaruji.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/7f92fac3addc84cd3c005263ef1de590/liruposewe.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/lasugezivutavegapato.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18053521661.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/37144201564.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/65666656019.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/23831886648.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501101626980386.pdfIn PDF document text
    • http://arucax.am/user_images/file/tegofimumim.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gudexarewomebote.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/saruradepowavaj.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b94d1b0b2d---zatogisujajep.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/85507151643.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd9d7dd45---wofoworexemixuful.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/86281859701.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3c00cc0474b03fb99658e0d18f5ff4d/jutabuzereroxukoriwuxuwa.pdfIn PDF document text
    • 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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 10640 bytes
SHA-256: a3f596dbd482bba33764b70dc95c9b6ac5cf944192841908b202604042973952
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 18348 bytes
SHA-256: 1ce925178ac39893117f5d2b83fedbeb0ea0b080ca52576ace777d19ada3710d

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