Malicious PDF — malware analysis report

Static analysis result for SHA-256 526278f6dc47c5bc…

MALICIOUS

PDF

82.1 KB Created: 2021-08-20 17:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: fb06761ce8631aef0af33e425c74986d SHA-1: ce2fb9b2602e44eb59a0aa5241afe75f262a609a SHA-256: 526278f6dc47c5bcc1a8bb916891fec2401a7fe5adff030379727d789186934d
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=set+a+light+3d+studio+serial+number+mac PDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/31b29fcfac0d88e6ffded10e380bd541/94051887676.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/08fas1qokhtq7cehf9d16qnfpp/pafuvukuverali.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/kaxesukakija.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2ibs9rlkglk7g97l7rqoaa8n06/visuzedufopijivanozat.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bq2gva5spr6ut9vdjs9c005e22/77115481886.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/j8cim4n6pv2nqdc9a7rcbkljj4/62634292773.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/dubanojesukedobenedu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/waxopidezezasojupexusu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9c116552---jafedatex.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/34326445501.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tviqoe9051e4nn71hvk3lholie/29068510273.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vemibi.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/19322221086.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1325f95e---62657359690.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/37135559476.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/43762db887497a5bbf26ca3f331b3f25/9469771962.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/33629081265.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/wilujosarokazuteledurexu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/2106227656.pdfIn PDF document text
    • http://climtech.com/files/files/boridanavotusupi.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/ziluz.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/basozakuwi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zonexa.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/sivepoj.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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 11304 bytes
SHA-256: 54b602c04d911d940e1ffede8cc90d311dbf8dc82890205a34b1f46ea368d8a2
font_02_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 17612 bytes
SHA-256: 48701951bb6b65836e42981f1377c3d0a75c2646f4ded95908bb9a88645377c0

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