Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac4919f89869e56…

MALICIOUS

PDF

98.5 KB Created: 2021-06-27 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e44346ccdcf22ede9443bf4b46daba38 SHA-1: e8bde7199fa48f7af7f1536baba8f06cd3df8a39 SHA-256: 0ac4919f89869e567a9edd3ec1d260be782ea691b99c401ded46c59c39fbe449
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5f08761c0ee922d1e28f75ccc68641e6/resiwevapegixaxeb.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099439b88e9f---85627787762.pdf
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c106c7470a52b3a9d46084323d355002/48922493887.pdf
    • http://hzdsbg.com/uploadfile/1622118483.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f3a0e338---76484232397.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d3ab1a0ffd9bad295e8b077d02af08b/vibesaxepiki.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608536afe08a3---rojanavaditisabimefopapi.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ddfa4e72bab961bcd480e9d0343981c6/wukejuviwov.pdf
    • http://wedding-ideas.ru/ckfinder/userfiles/files/zoguzipemopozominese.pdf
    • https://tahubunting1.com/contents//files/gukifetutufipitit.pdf
    • https://amatnieks.com/pictures/image/24317358149.pdf
    • https://btsis.com/upload/ckfinder/files/66744935011.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701e6d3f369---31313701254.pdf
    • https://toskov-yordanov.com/userfiles/file/1017579135.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4fc0e235---78760544438.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cff0d876d95262280c94daf47b1f6630/23206175014.pdf
    • http://venusland.vn/app/webroot/img/files/kakigiwegudi.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a90646da06---29422002643.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/u9fjfb3ji0dea8gl5d5mt2i4h8/47111981613.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/dcfb4f6fe5343928cc1fde3432072e6f/vopivonawelolasafomepa.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r95o9s2r90jnb794dv1sbqo776/kuvapetemakoterifa.pdf
    • http://614move.com/clients/4890/File/2337376607.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hcotoe9ib5eqp58d9ae8pvrnce/jipomapax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+modern+theatre+is+the+epic+theatre+pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc31788855---92518841576.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d95.bin
94755349673d80c2c9674dd3afe9e79d7425f95bfcb57689cdb190ab1a9a227e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 10800 bytes
font_01_sfnt_off00013645.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16792 bytes
font_02_sfnt_off00014e57.bin
f09187c0cc749276d0c1ccb1d16d7f14b0757eefe7d24e513fe2ffd993328357
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E57 17748 bytes