Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53163b7ed225386…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 09:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a9e589f15fc07bef104e996d307a4c1 SHA-1: d92e427df82f15ba79719b84903fc98c33fe33ee SHA-256: a53163b7ed22538603d57e9339c9faa236fc2cb581c99c4699b0ad58b5e476a2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of JavaScript points to potential exploitation or further payload delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/08775dc8cdab4dca96c709029a03d6c9/tuvopudakogumokizava.pdf In PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/49213877319.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/28110597618.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rorifugabifaletufaxiji.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/17355402866.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161205fb1139c1---29940841445.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b054197bb---nimisuxiw.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/nunosusad.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b15ae4c3e---jisilesafoxizeg.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/50308035895.pdfIn PDF document text
    • http://oris-am.com/editor_up/sasazedakufi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uu35cgnquue69cje73hq5dh0j0/lilajoxovivalegumovogi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d10ac8ca---nobesobojafuvorot.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108192242382071.pdfIn PDF document text
    • https://medtek.vn/storage/file/tozowir.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cqaqam1vfq9c9t81tpoj6qh0to/9178505880.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43748afbe2---29660561739.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/23817439811.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef08fec001---13016293482.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/zufuzobo.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/88678783567.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86164224979.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///52283064906.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b97e162d56d1aa8bdac265d857d60970/21358899333.pdfIn PDF document text
    • https://digireg.nz/upload/bovekufebugumatufamevozat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=online+pdf+splitter+sejdaPDF 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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16400 bytes
SHA-256: b79380e8c1ef25456be019ebe07ea37e06fa81de228e97c4c8ce6ec7cb6b27ea
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10524 bytes
SHA-256: 5e33fd7c7ba2ab6b63a670e48996e497d5521aa2e028b43389d5387f8e9b1ae9

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