Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a564cb393ca8b0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 09:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b20737a9c2736b1fe33460fc8a345293 SHA-1: ce85163a378cbf7a898be6530a62d95efff83f02 SHA-256: e4a564cb393ca8b09c2accb90899df6a7f53c1f9959a8ec9b02df2037daf0204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an intent to exploit users through indirect means, potentially involving embedded JavaScript or other document exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/44804ff720f681a99dc2ca2600493152/1298521460.pdf In PDF document text
    • http://ride.hu/images/uploads/files/ruguwuze.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/jumiwowa.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/79991506625.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/4898b732e267c8838e7246aac1b1c7a4/75515122482.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/gusana.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rovuvodewoxale.pdfIn PDF document text
    • http://opersan.com/file/rewik.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913752b792a---35369564723.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/gedevekotatesevarema.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/wemikepabamirowebizoteki.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609844ea74708---sulamemubi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/walisad.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135906abed5f---59370573481.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/waboder.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/11837815688.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2caeedff---16186729033.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ioce2rh8epu64ob8mk01io66n7/ledavuvakimobalufilar.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/31356496436.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/70669891012.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121768dd278d---pugaxidome.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/ae7c33b9c35f7e1e1f11e128f7e3e307/lotelivamozegalozazij.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/mm8cvrk9sqb775jtafnjcddjap/85632065232.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b13e43a8033259d8dca868f81a6b44e9/pabis.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2r4ks5mmva5nme0shgbj0gf074/77577853144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+english+constitution+bagehot+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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 19564 bytes
SHA-256: e081dbc66024d037ec4d73d088da740e36df61004882002698a43b086bd0ed73
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 11000 bytes
SHA-256: 0c1af2874dd58656a9a38fad863781cf429f58c06f782c71e1e07ed1cf3c5c89

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