Malicious PDF — malware analysis report

Static analysis result for SHA-256 682b828854217d22…

MALICIOUS

PDF

88.5 KB Created: 2021-09-05 20:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 596ce5b4ec42a4fcd1117c407b884f23 SHA-1: 9f7b27b19ef5190b7c1c66176733f8d02b9c84c4 SHA-256: 682b828854217d224c0541afce1d3dd3c6a610ef5ccb7bd142764b9dc8b1344d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm, as indicated by multiple heuristics and extracted URLs pointing to various domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the nature of the link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studioindelicato.com/userfiles/files/6847555456.pdf In PDF document text
    • https://tidaksusah.com/contents//files/jefasujaminararo.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jevukanu.pdfIn PDF document text
    • https://webhosting4.net/media/file/12974175143.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/93946d13a4eaa87aa24cdcfbe681cb15/katarekipomobuzotiwivo.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/82999007096.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/xebodamobamazojokoxa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pujanenidewinatap.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3115d16bb---74548733689.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/79365188400.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/82307889201.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/13537405995.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/52194586453.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/kusejovagumofegazoputizik.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/desutovufudovo.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fagowolanuxumozefobevuro.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/31216264464.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/256d493bfe84fcda904c8eba3e847d00/50190729212.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084798883b97---puwelotojedix.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/50054976056.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/barefitomaxibate.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2460d65f---zevabezabewedatid.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/73565351889.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/lakotokepegupirarufizek.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bc08e864027116eaa08b60488abb527d/zonuzomoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=buell+xb12s+manual+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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10816 bytes
SHA-256: 9e4f71ee5556f18b7e35f8f415b8bdc06456749c28571af63ca4265ac7fe9bca
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 18136 bytes
SHA-256: aaedf94030fcb8641e4f3b8c4b48c2748c82023cd255b719e7383a437ce4c8ef
font_02_sfnt_off00013c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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