Malicious PDF — malware analysis report

Static analysis result for SHA-256 2983f4c8929ec2c0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 23:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da3ab616d7873df9c3bafc79e051eef SHA-1: f9bd8a8cc98b91521a1c37f84c262a561bf49d25 SHA-256: 2983f4c8929ec2c0bfa17e17eef62ab33276e1250e1d7917ca213bfb1e7bc601
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure victims to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=pdf+compression+mac+os PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8825bbd808---73636718354.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db3fc25debe---52237885963.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6aff22a82fd657db7af7b70bf9b9a9b9/wuzor.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ce07a7af1738ee0827a7032531719059/46255787442.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/28983690816.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/29865288378.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/83007951878.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fa462a5fd7563926a409788b059d3cfc/fawijasedavuseluzofitize.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jumeviwexavurovejobug.pdfIn PDF document text
    • https://superchills.com/userfiles/file/penewosinujelig.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7da559e40---zofofosigumigiji.pdfIn PDF document text
    • http://absigorta.come/file/suwigolesenovodut.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/96347473423.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/377c1c82223084bcdc97e7542029d748/sanebojel.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/sikafusituxif.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8298b24a68dc574924ce2472be91dc42/girasupudalesaxovusiso.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/mowezarulo.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/43092304544.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e25d5734---43806264692.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/64541140232.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/binoguduk.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/nukozesiverujokilu.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/18144087814.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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 10636 bytes
SHA-256: ef30aa1b62809d5e6c74523ceaff6a5f4eeaacfa13e3cf18235c1db241ff0d2d
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 18080 bytes
SHA-256: cc7ce3448e59baed403bbfd99639b1ef1802cf7bad7adddcfb4b3bbd033de55a
font_02_sfnt_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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