Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cddee9a32c4b710…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 18:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0f484d0bda66e61b67ca085386a32b80 SHA-1: 12ae437ad52c1be4a45df0d04c122e64b181e2f9 SHA-256: 9cddee9a32c4b710c5a8f3cf87e88aca07093e14a5ca2bd84f6023b4992104ab
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the link farm indicate an attempt to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598c78440c---fikojotewibobobenonuv.pdf In PDF document text
    • https://techson-cctv.com/upload/file/81868420724.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/65l5defp7c3l8pdqpsl4ni5k2e/riwasawuxurakebibod.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109110134041474.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/nabiferibiga.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volevunatovepuninefam.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/gogerov.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/82416625336.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kutibexusatizigov.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/guzimopuzimusugizovubasiw.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/22537261846.pdfIn PDF document text
    • http://contua.org/userfiles/file/kisifakizijafajeribolo.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/22911662750.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lonavapepojudasukaxifo.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/mabijoremoberejuza.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/kemuma.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/db189dfbda11adc0e515d7b4e6d4b3b1/65456582786.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34762608535.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/55405889843.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161422f7744c09---rosozovunepumenowareno.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109162223523384.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/47222775816.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/muzemovabosewejiko.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/sibojovaduwibu.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/sobira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+screen+chromecastPDF 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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 17892 bytes
SHA-256: 13500a7400607164a7526ba217c88367cf3a1749d1d6c17c39798066aa5bdf32
font_01_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 10568 bytes
SHA-256: d6a524248c7de8022ada7083882f633a7572bfdbfd217f5ec0857f05c65b8e2a

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