Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff3fda91ca4b10c…

MALICIOUS

PDF

86.3 KB Created: 2021-08-26 00:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea90b1f5feff15d8eadfbef74ad6670a SHA-1: 88af7e87cda446c5c4220dd6eb25d4e6b633102f SHA-256: 1ff3fda91ca4b10c29b892799ed942a17bd3d565956515fa68968c86c15c982b
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=edema+in+legs+and+feet PDF link annotation
    • http://www.klimavill.com//data/editorfile/mowubuxot.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/64583068300.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/46341104800.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/zesosamumotede.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r334e1mqb2rd5oh6g614ritjq4/repavibaporukezizub.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/27399be47933c21e3f2377482628a46b/85838321873.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/698ce4bd9ba7bef09a8dbc83002fa7ac/33863711402.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1618e4248e---lonifotijabut.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24bcc981c---91790730531.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/63592119986.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/11150802497.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/nut8ih4anpe8skvjjmnpmiqt2c/rupijoxipasadevuz.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4p16umkfte9dg4knr3kdllfva3/tuwoxigusarujog.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/63833534917.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/lusokokotesemaziw.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9eccb2668---mujuposateded.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wiguzixodet.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5eaf6870c---84233946121.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/frfpnjvrjo4c7l2u9c242hhcc4/83872038114.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/33085658592.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/38154095725.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mesaberijefoworirazip.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/rodakumezojexixumugonilus.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/85814105223.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/40067417415.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/85236979459.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/954e426026ecdf391e5d99a8f1958f40/28217383554.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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10460 bytes
SHA-256: 04aed51087b7a95114ffad83ef4d31ac205f5fe07f2bd27c854435d10b2daab3
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 17188 bytes
SHA-256: 7f73b8b89894e56b6f29be47db00586c0d212b1a3c53883af1807393c20661fd
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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