Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bc3adc89d711a4…

MALICIOUS

PDF

69.3 KB Created: 2021-08-03 00:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71f90c01441bc6472e7aad33c51a064a SHA-1: 161b33b7c5f6f2a667828205b296123bf22ee448 SHA-256: a6bc3adc89d711a4f01aacb130ad1e1fef4f7659933b0cb4bbb254451a5ef56a
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external links and the use of compromised CMS upload storage suggest a multi-stage attack designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7780

Heuristics 5

  • 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
  • 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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607741ee3a450---tokujunimufiwekuti.pdf In PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/60200190723.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kimalufozemurifizoxilaxo.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/95972078895.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/70358610556.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f891d783---dupaziwef.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cdf7a06bf---wenagizuseda.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/93351005908.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c6c47230---67538031484.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160741e91edac9---fasagipuzuxififipod.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53639ceb6f---wisadavopesan.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5a708fb---givoxutupu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/72894827616.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/949084917.pdfIn PDF document text
    • https://efnnma.org/files/file/fefepe.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/686dc5ee748cf04f58f96b7d34250180/66224979957.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cbbf5a85a9a2ee1dd193481c72d44d08/53433088121.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/danebakoteda.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v7cn616h5vaib4mf2egr3cf3je/90181589385.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/gobobebajunitusagivo.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/fuwopogubipoxagole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+reset+radio+shack+weather+alert+scannerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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