Malicious PDF — malware analysis report

Static analysis result for SHA-256 65280868f73bdf83…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 13:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 599357b49ffe08dc552ff388835e7b34 SHA-1: 0f4ef161db8974f7ff84cd9ef4199ad033e6fce3 SHA-256: 65280868f73bdf83d840db1ba9067d724c5502ddd469a0bfc3155c6dc0ef86ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=remittance+in+bank PDF link annotation
    • https://businessservicesuk.com/userfiles/file/difazox.pdfIn PDF document text
    • http://vhcvietnam.vn/ckeditor/images/files/44230344951.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/69518051328.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9321808e9e1ef744587d3140e87c029e/92689777061.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16085d89d316e8---18709065162.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/siniroter.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/av2eoo6617uocn660fgqoes3p5/wafasikopudarekegarafat.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/toxebinifobokibe.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/widuvixop.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a2d0146c---88677415793.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/10f57a0841307126cfec34ff5eacb052/kimexoluvigox.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/jibobalatolaw.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/pegemaboji.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vaxorupudamopumavew.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kokup.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bc9378c4ae3ffde3ff32b2e2dd9d4cd4/2858712164.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ef5c464f3d827248c54abeb69d7f355e/15184029075.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/72433648992.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/zefavasibatuzegivatezite.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/nomuvinare.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vivete.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/76418721197.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/sujejatawi.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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 18488 bytes
SHA-256: 24f5be3b1157952458c4076f9e6d421b1af0e617133b8d8c9b43a53af4a9e250
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 10236 bytes
SHA-256: f23e0c1531ac4980ad2e41a4ff725d6a313462ec3824b4a09d7ba84c564228ee

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