Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed28a2d1202568cb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 13:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2562cff3a773391b8194eadb8444f999 SHA-1: 927d27ca051a0d39031186e4f4141650f91ddcc0 SHA-256: ed28a2d1202568cb25f3172dc44b68ebe9597721759c4fac1d9418f169e6af73
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine rankings or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vpntraffic.com/upload/files/fuzebenu.pdf In PDF document text
    • http://szakkepzosiklos.hu/upload/file/jalilani.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/41006669304.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/pozemijevutuw.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0e5a6719---zozugi.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/54930094952.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/839252d17a064bba0855b41638fbee51/50972802487.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/882651a967d912b863c22901b0523513/gemetaza.pdfIn PDF document text
    • http://beateromer.com/bilder/file/lolerunorimusovekomigazeb.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/85715603960.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae7ba0771---jojewewofusumoludisile.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e31e8c2d3---52206428651.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0a0966a58c2165d74ecff1c903bdb893/javejosixedisenolofexaju.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4d84384932c7aa9a43e82a33c18fdb49/75520837190.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087f11f7c49c---29378875868.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210627122627.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/dejutebakorediwozubiweje.pdfIn PDF document text
    • http://belst.by/upload/file/99995816717.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858b3de389c---24745061325.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/wotitowixokeza.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b69aa525---42024153668.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/taworilusepulufiwuk.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/sorademakis.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/48919450205.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/xedov.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ubntsa5md6r579ifbeed9s5a11/15224946755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=causas+de+hematuria+macroscopica+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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10864 bytes
SHA-256: eb5face69c6a3719bc09abb5e05f2c89d7b0a9d9c0ca19f2e3099cf7f0c14144
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 19556 bytes
SHA-256: 8c4b435e3178de2db8ad654d990a4956aca6dd4647af47f4b19f9e164ae281a3
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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