Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0fffedd5a5f878…

MALICIOUS

PDF

91.2 KB Created: 2021-08-07 13:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cee7deaab43531647ebd359944140bb0 SHA-1: a163165fbe068e9b8e2d4b35adb115b70f86312b SHA-256: da0fffedd5a5f878ae05cca86edba1175ce83e5cde6e2cf185bab4f43d740599
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cructi.ru/uplcv?utm_term=crush+crush+diamond+hack+android PDF link annotation
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5lvf33p6v44767vjs0mlhkqjsc/jujinuxupakarezalu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c77d9ba---kotuji.pdfIn PDF document text
    • http://millecolori.it/images/file/95604586054.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d10c00e54---bexusetosefasisuvaj.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/92369902648.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/52969936908.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee502557aa9---3075517846.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4f5be2b8d1240512aa620a33e8cb1054/92170226766.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd6fd7a52---jesesonatovowotodo.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/kijeg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda9f321871---relipelojenoxojofaguku.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vazevuwa.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5b6432f7---roriwaxuvibati.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0215216001620682662.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160878b7ecb248---datikixisasinevarivaje.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075170257470---58503646738.pdfIn PDF document text
    • http://fitviewer.de/files/file/58006953634.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/59074231770.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/24188037112.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/89ebbcb06875552745e81e8b35cc0363/buvulupigo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kalezasar.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4m5g49r6d1ldrofgq43d2voapo/jisiwup.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/22330126593.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a38f943cb---sezadub.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10580 bytes
SHA-256: 810de1cca54433d1c738be30f3469e3a676754c3eb8abc4109ab6674f4871d86
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 20084 bytes
SHA-256: 6d96dbc997799792eebb7c451c9a3fe18aec2cb47ac2aec103984ad9458a49cf
font_03_sfnt_off000156fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FA 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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