Malicious PDF — malware analysis report

Static analysis result for SHA-256 4306b85605bcdc35…

MALICIOUS

PDF

92.0 KB Created: 2021-08-11 01:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ab9210c52d45573e301c4247f471928 SHA-1: d97c83d9f74904e6603bb7269fff9b59c5c733bd SHA-256: 4306b85605bcdc35e15eba30fb07c8112047826449d04874114cde630b6b043c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate it's part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://soyana.de/js/ckfinder/userfiles/files/29983064197.pdf In PDF document text
    • https://frontivo.ro/userfiles/file/bipagonilixaxikeliteperol.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/1e25650bfb6cb4dbe43ea52ee4d5e61b/51939912307.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/99549774337.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/52961991069.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/186904892360d74ed27e589.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeea1ded19---pisilezade.pdfIn PDF document text
    • http://nscenter.cn/upload/files/98382549069.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/dolozumawowuletukigages.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ohjdvbtfo9mij56d70hiv57lsv/fepadipipamubaruxokukage.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gapudoradisideboja.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/bogegopugirafidibigafige.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/97192782293.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/gikoroxipadekusabanitezek.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sawifexinajukafisudi.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/no5i1ip0j4638nhi963h8estok/16551379240.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1b6909cb---dokakuvedekotefasonum.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/92364893241.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/88dcfc389ae5df1b538a123309169761/dosatulowifekomifosamolu.pdfIn PDF document text
    • http://tochalco.com/uploads/files/lubojedaseminotas.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/51201547908.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/lififolarajirogi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161074d6bc16f6---75058359790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=female+masculinity+judith+halberstam+pdfPDF 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_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 11224 bytes
SHA-256: 8cf83ac629d34e665dc4d477080ec5a30b3fb611aef5c04ed9ca42ba2c0b7d08
font_01_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 17104 bytes
SHA-256: 759259239e5c8e35cfd1cfbb4fc9e01056ccd5e4cccd42db2b7a2f4c779facef
font_02_sfnt_off000147b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1