Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cccd8a1d4675570…

MALICIOUS

PDF

83.3 KB Created: 2021-07-18 15:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 90411ee9567a40ed9379a8b1b657e8cc SHA-1: 6e7ea5c4fa2aa1aff40cbb0ed47924aeae9e9b63 SHA-256: 5cccd8a1d46755706c8f4590c3a57c990e514df61efef077d6acc6c0dddff3fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ncabhsa.com/clients/875427/File/46213348071.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2j5v5ta5dltihs0n5t41pr6r7/77576966867.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/64314035908.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/28139925716.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wokufuwalaxegudesopo.pdfIn PDF document text
    • https://makenie.com/upload/files/29827386558.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/37a8cf2191ef2ac281df38cf0e462482/73209875550.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/39761353426.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44cd38593---26766823479.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/jolupurabinetibarewoxife.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a044c63cc404f60c4709550c9568192e/60862963798.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/62623171485.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608850489dacd---vuzedujiwi.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/xijefuzivubiba.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b602da310bc---guxapusizesuwobifijerego.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lixalil.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c4004405fa44c66007a9c0261d63b842/79004686717.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/25cd2r1nhanc96tngscjjsv5rt/52595810909.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/jorugig.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/warokelaxikawife.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1d1ddde4dcafaa2d1efdc9a4f9e3e200/75920276268.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/furabelakewilizez.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/38432178438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+comme+amour+piano+sheet+musicPDF 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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10676 bytes
SHA-256: 40235463ad369a60a5ef7ce45bc530b241326ea0d79c07075c1f1db213209cf9
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16904 bytes
SHA-256: 24649936bbf2a5cc29b329aa4c72ca0b113a9a8d67d05b7e4784d570df0914fb
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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