Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4cd6172f2b4c87…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 21:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 990cf19e6ef5aa998967a1b7ff6e23d0 SHA-1: 5d264b37eead6095e815b6cfb8116e143c079258 SHA-256: 7d4cd6172f2b4c872567e424e111a224e51287996b9f75ae92031e21c1a34618
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387abde24ef---berunaxetadivilezot.pdf, are key indicators of this redirection tactic. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://montazenabytkupraha.cz/files/file/54828105857.pdf In PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/91191337154.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/nasejajuzidapabi.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/54456359637.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/lexeliwokenexuf.pdfIn PDF document text
    • https://kermanrooz.com/img/files/sawaduna.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/xuzomozukodubawivejozis.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614163848f874---39684838324.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zubasufu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161427ccbde461---bekijakisupejewa.pdfIn PDF document text
    • http://philipsphotographystudio.com/rabutir.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387abde24ef---berunaxetadivilezot.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/36246489549.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910014734.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/28623293239.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/befewazarilaweropumotiku.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/62638282377.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/xizarisowesevetosupopol.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/42392651344.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/16252658993.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/72160496827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=capturas+de+pantalla+samsung+galaxyPDF 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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 18984 bytes
SHA-256: e6399c4a3214edb1f6abbff2778d84d30cc30c3729c952d80db8cbd4034adb70
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10868 bytes
SHA-256: 34a4d9136d3d80e26a509efe05006aad3d1675caa0811c6f7f1e630a6be12537

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