Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527f2822cd6951a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 16:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c56d27413e8a9aad2055396fb78218f SHA-1: cd24273ae842179226a245446ea80703a5565981 SHA-256: d527f2822cd6951afa00f9d64f69a4de7774695ca778d0319b725debd351689a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised websites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to malicious content or phishing sites. While no scripts were directly extracted, the overall structure and URL patterns are indicative of a malicious lure, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=toggle+between+worksheets+in+excel+mac PDF link annotation
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2vmkgf3l7u2ajnog4skinco1ek/55135262949.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c5a1f2510d40328a42fbb7ef94e5e641/12832419859.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16092fbbc7f409---24485015750.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bdb342413---11910719887.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210826_A1A9BED916F446F2.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a9144e6198a75e07f2f451fcd5c8a956/zuxula.pdfIn PDF document text
    • http://maksimetall.ru/files/ralefimiwarinive.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/matesumeb.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/visexokafupaserebenagezix.pdfIn PDF document text
    • https://rajaunited.com/contents//files/fudepijekab.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/788r04fj8pluo9t0jj1ia2jsns/47974675408.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/59998096558.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/65416886624.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/eee7478bba0eb54ca5954344be4c6025/riravubi.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/dewovazarexanavudev.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b60cb612ec---nixuverofivefulemap.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c4385a42---12651049831.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/3no8i3j8m9e5i3vecs54snpta9/87890248928.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/zosinafufezigoru.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/56251551852.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/7090191191.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/bugagozunefarenureza.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zenaromat.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/giseravomejenivi.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/zapiriduvorupin.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ta2m99soo2j0hnsnl9bea4nqms/maxozaribuwaj.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_off0000c22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22D 11060 bytes
SHA-256: 04b08b7399d941db81cc9d6bbecb6a8a820998a8c3cafe21ccc430734c750981
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17300 bytes
SHA-256: 739b452a270e55c5ca0a3256e5eb518fe5b3e37e5aaa31b94bd063a9a7a306f8
font_02_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1