Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb2e8ce8cc3fb8…

MALICIOUS

PDF

94.7 KB Created: 2021-08-12 04:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e5fc6969c7c124ef04dbaeb375e066f SHA-1: f38bd4a7cec25a32c84a8bc049b288ba3f9afb7a SHA-256: ffcb2e8ce8cc3fb8819c6f7f9a8de3cd88171da49867635dfd18b7eb222725f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. The presence of multiple external URIs and link farms points towards an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://menlopark.com/wysiwygfiles/file/runamiwifu.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4959bf1d7---37940408364.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20b844c92---duwutuvuwitom.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062700562573499.pdfIn PDF document text
    • http://araonline.hu/uploads/file/12483939811.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jqb8b78cplviqg1qvmi2r4ogq6/wojuxa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f29628ac---2530164049.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/ziledi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094640a3133b---lofenorazedufirutuxar.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/56655788159.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/r7lcqg8dl417k2hgnh3b4ug0s3/78995781181.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/90220458198.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/valul.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/petifejira.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/juxutipowilokawis.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1415943f6---zikezidekatebilanezoxo.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/10818827462.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/95791359945.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/14336232720.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/lojegisufekem.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ea65773b---ludefikikina.pdfIn PDF document text
    • http://learningkey.org/userfiles/85964061218.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210716055437.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609426fe98cb9---malavifunazibuwane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=finite+and+infinite+games+bookPDF 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_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 18012 bytes
SHA-256: 167b1a748380244e19f36075ff45b9717473a9487a14a6791809f2a589656aaa
font_01_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15380 10760 bytes
SHA-256: 5b40be04aee976cdaff459ffe3aea6afe6b1ccb61c915a77006b1def932f115a

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