Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad19f3a7e8a3fed…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 21:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69329e4fafa277edd7818b97f7a1a058 SHA-1: 63058851e0c735646d5c099ba5c01f0bdea7ca8e SHA-256: 3ad19f3a7e8a3fedd40d2b6783558aa9351aaf552d2e58b56fd95a2ec5024512
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external URIs indicates a likely redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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://kisikana.hr/userfiles/file/11234185188.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d7f6a15db7d---xufuzof.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bekavevumafezivuduluf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4835e2e6b25929b4936fd47baa7862e6/70983343824.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/maxinexix.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/34012157647.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/24241125761.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/duwarukuserar.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/riwevirenitutamodinotusa.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b7bc4e871757f3c4ad5890285701489a/voxemuluparoj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d48939953---3085808804.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/235972160.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bf7037f2---sefirisa.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/48a3a363163cc63c07948dd93796aafa/35285991671.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/raguxotetolenomonuduz.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/63570996174.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s4cmvjrksen2tqucoeklnojg31/75027131848.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aaa35ff3e7f0a3e305f234782189819a/61018080996.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4dd7c3cb7---13008829175.pdfIn PDF document text
    • http://mextro.de/upload/files/85270357087.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/mitofatenuju.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tamixajekogofubamoderat.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/pufigoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=advanced+control+system+notes+pdfPDF 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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 17376 bytes
SHA-256: afa81376e1921e1fc7c4500602ca15c1efaf1e189227ae61b35ff91933d5d95c

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