Malicious PDF — malware analysis report

Static analysis result for SHA-256 369c7769f3ac5364…

MALICIOUS

PDF

95.9 KB Created: 2021-08-17 12:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3571fe905384c8da4b8ce426e5123dc9 SHA-1: d432e7e00a8445adfaa668b11589a0009dc62643 SHA-256: 369c7769f3ac53648c2962e2766ee1af6279257faa6bed2d33894cf6f6146b0c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=how+much+do+great+dane+puppies+weigh+at+12+weeks PDF link annotation
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d04f0906d66e640d34a6621da48cfd92/45510050665.pdfIn PDF document text
    • http://normel.org/files/upload/file/mukexevo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/67f16e58b9b08e3c7ea3e50580a94d01/moleluditisipuzamuxux.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/28495338963.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fdb046c42---gaxogulafajaseno.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4bd52058---gajonixijefuwekufotex.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e466f48083---ruruno.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee63b036e---fibofuvabifuwofurovufapag.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/ferilalubegorejodogumuse.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6a74b4ddf5f67c7b6063d39a3b022481/guruwafefekotawe.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/kisuraw.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ac24ef9e---xulojufuvu.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zuvibubuva.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/rijikuw.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/37635122529.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/juwomojagazuxumenolutanub.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610891cc3eb7a---78855827507.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6897a867b---xoxusugago.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675ec9d687---5005288976.pdfIn PDF document text
    • http://ecole.ru/text/images/file/rurorowugemubig.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/92143928551.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/pekebuperitunexalifufum.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/26953209512.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c58d8cea2---59655099736.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_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 17576 bytes
SHA-256: e9d412f02d50c1b265274d56a4d8b6bbd3d8a1690ad6e712638f79d49b4fabb6
font_01_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15424 11356 bytes
SHA-256: 287cd61bc0b6e792858bda25fa65bc873fd17d4ca3d2cf3925bddc2237cddec6

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