Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aff3b023136e0c…

MALICIOUS

PDF

99.4 KB Created: 2021-09-03 00:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5f32b6177c706c4df67a7baace9efa5 SHA-1: e8326041e64943b75cf88627f1edd5e2fbaac75d SHA-256: 50aff3b023136e0c435b8848694f39af27aff6db1821e1b0d70750f3b0f83ca3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable hosting, indicating an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kozmetikadunakeszi.hu/userfiles/file/40979394667.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/vikobijovijomenegixufe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6811e3fb7---73046816144.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/velovamegifevanovod.pdfIn PDF document text
    • http://c-six.it/userfiles/files/90344521669.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/nadamaloluluvekeki.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/27697364489.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5aa60ed8c33d1c2a4fbe82d5aa1bac12/11858685432.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/72504787659.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ab29505175434fdf56be250e993a8206/67393944954.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa75c4589a6---gurekinojexidego.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fa1a2668d2f6b98cadcf9de6234558c8/66140824921.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4c2611e4ca16b9d4c0dd9afdb0e71fa7/xubezowu.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/dufuzawerafisute.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e4d29ae9315bfdeae9ac17a591242b0f/48153454388.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d29015c1b---rajugetavewuxifememokus.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3dba58d83---wowid.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70397645d---mivevezexawufu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1b3512fc---pexez.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210805082633_byn4kj.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a557f8c89c3---89454411881.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/eoup7c9ri72jonpde7bjpneem2/54212150501.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/setafarawovunut.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/vufebopenujesirep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sch%C3%A9ma+domotique+pdfPDF 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_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 10940 bytes
SHA-256: 5f2104e9fbb408ec78f961d009de3f712d800cf6048fd23392d4bb547e774e8b
font_01_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 20512 bytes
SHA-256: 35fbf7f9e56cc8eecb1da2068e37ab7bf6d106b0e69b803cc5b6e34e29806d48
font_02_sfnt_off000166c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1