Malicious PDF — malware analysis report

Static analysis result for SHA-256 8299a480bbf7ee54…

MALICIOUS

PDF

74.6 KB Created: 2021-08-29 13:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9719adef7cda2bfa6b8664849213374a SHA-1: 412a3de5a11744bd6ffa08f0a4114900f9057e26 SHA-256: 8299a480bbf7ee54e03ded0e837dd75ab758d5174ec744a0e6b0f468ef67734d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV, indicating it is a phishing trojan. Static analysis revealed numerous URLs embedded within the document, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of many external links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0930

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=ds+20+form PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519234301453230.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/83927120550.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/16854542073.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/514941c76db3c0dc2acc75cefa971750/97012647683.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2544acae77---xaxabupepufupixoguk.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/67089632730.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4bd1af15e87d6205c1df500c5cbf625/xiwufege.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b19ae2723---23356628570.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/fagurulesej.pdfIn PDF document text
    • http://atek-ent.com/upload/file/vogajuwamoragil.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/47589033203.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/3273567129.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6ffb6f9c59210ab0f82cadcc87997bc6/32034381163.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/7ce50a5584677c9d388a8a1c428dd0da/35887723252.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0f72fce4cd191333ac136d9cdba7660c/naketipazimulakimewabofe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16120ac1448263---betawamibavofiriv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/97e33461c492320d76b46bcf65db4c07/xajumusigawoveganaka.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/juluxiniwalapotida.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/jazisilusejidufoso.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a110a8bd1be---64164091432.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/cefabd4bbac22c08fcc289c998e2631f/3374419566.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/74312547301.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609027da5bc45---97902579289.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857da04e442---xufipotawar.pdfIn 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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 9984 bytes
SHA-256: ae4fafe0c50ed33fc493d365f16ec67a2b2f0b180dcde6e5a8942b0505b26439
font_02_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 20908 bytes
SHA-256: b230ecea8d5278082632902042501f948abd2c62f27ae4558bd7420e6b887a4c