Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8ee404d09dcf89…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 02:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a248a4e9a575964c0b43f5bb38fec0cc SHA-1: ee1f641e15c3640aa39c80eda8f731844d3a9624 SHA-256: 1f8ee404d09dcf89d64df13bf2216acdd59a8f95c3347a9f26c726e79fcec3ed
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of multiple links to potentially malicious content suggests an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36ebb96c6---linodozutofotixu.pdf In PDF document text
    • http://nextgt.eu/uploads/file/vigixesi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840382a024---59727426097.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/folepusoj.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/95520457623.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0987bba17cc984a556caba7a01e64962/18048222937.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/misufozuleganoda.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/68724292895.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/91491022814.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/barolezoxizusuk.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubf9h188o5mochfmc17md6l9d1/kosuzavirebasexi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5aef6a7b568d1e458d5913bf91a39a46/nelimurotakoda.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730e881fc6f---24418263534.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/jaguzelokuletatavepakaru.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/wavurojuzire.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/48843857858.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/fazarefut.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/65745830111.pdfIn PDF document text
    • https://luminex.pl/upload/file/66205361444.pdfIn PDF document text
    • https://gangnampools.com/contents//files/poluvuzisetururevezavevom.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nasedakutokidagup.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/butd5mhp4r39ea392kdcjdojor/17953286544.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768c623d95d---83746896136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=manual+de+ned+repartoPDF 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_off0000be67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 10216 bytes
SHA-256: f7c7c168b5875785533be71f49b7cbbec6c8b9719bbbf98417811d7abd56d8bb
font_01_sfnt_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 18116 bytes
SHA-256: 533e31c8ba200609c1126413b461e7acfed3dee70369a9c74cdfdaba58173439
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1