Malicious PDF — malware analysis report

Static analysis result for SHA-256 8741830d59a3134f…

MALICIOUS

PDF

73.5 KB Created: 2021-08-08 02:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b19a5c87cc88cc2015d5d6e4ce91034a SHA-1: 2a75c55c6bc4213d9907bd7e6cb0b18650ed0895 SHA-256: 8741830d59a3134fb229a2879458af1691835678447a807f2834159afd8c0b8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links to WordPress upload directories further supports the idea of compromised infrastructure being leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=comparative+politics+integrating+theories+methods+and+cases+pdf+download PDF link annotation
    • http://bezagsecurity.cz/userfiles/29230314621.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e6104253---bugefekudikuvovivudiza.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078396b09670---89458291035.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/jogemanovidevaxenibe.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/vomanapixinaperarab.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e58c3a92---werafu.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/90795568298.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/51345383512.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbbf67cdc---fokozibefodoferoworu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/62681694982.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/71488604119.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be1ed177a2f---124401447.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ec466f98780c018148431653a9b10426/jivusirazogi.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/padurutogex.pdfIn PDF document text
    • http://blatt-gruen.ch/files/xinitipek.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/xepakumive.pdfIn PDF document text
    • http://master-br.ru/img/file/78697168420.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e6o14f0tltstov6vo499cp2bfs/gipukatu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/67736814497.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/samojijutunovubaxodu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fabb18044---7344605814.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/47323003389.pdfIn PDF document text
    • 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_off0000bb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16528 bytes
SHA-256: 64318d66ce5ac3ad4337ab75bcb7417178a0e703c8087c479bc00c4f27f85f40
font_02_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 11248 bytes
SHA-256: 4f25aa8d1747e11e4f2ba5774f91f3483c9ad68c43880de8ab067bdf30c2d505

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