Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b08c3259ee83cce…

MALICIOUS

PDF

100.0 KB Created: 2021-09-06 14:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1715893e413ac6388d1c415b9fb04b26 SHA-1: 9b14293326b446e51e5f5351161390e9e63542c3 SHA-256: 9b08c3259ee83ccea4b8ffe4d4b92d4fca296faf5cfb1cd962a9f1d8ca09a0d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd27f00e87e7d668fc9557820bc3c20c/64126940041.pdf In PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/23173374097.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a1d882e8c---wanulejufefebufaseba.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zitexokovugiputo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9860ef2387407938b737fe94b5d579d8/67684914584.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab1c3a0387---ribezirelowabin.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/72936475507.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jotelurowirisebuku.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/84751046271.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160971aee4cacf---kexobovexutokutipe.pdfIn PDF document text
    • https://energooptima.hu/upload/File/90681278877.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/67162479884.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2qk422vga49h2j0jrhkc6t5852/gisivo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/60891568899.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/75098089785.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4563d9c161f3eeef374bef4afb5d06f8/55647646984.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/nkgbq4b7611mpa5lqu1gri7mea/95262169344.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/nutej.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/88ab82d8f4cf58cdabc5dabcfeb7dd5f/13123652616.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/81678736467.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/59045197460.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17698fe96f626d335bb386581e7d5d24/72033863260.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1e614653a388aa3b577b489aa8d872d6/63869662041.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160860908ab15f---29226630229.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5d8da3ad5ecc5bfa88fcabd3d02281dc/7198210830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=protesis+fija+contemporanea+4ta+edicion+rosenstiel+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_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 10988 bytes
SHA-256: 09842d7ba0d9eab0e5f3fbae1ec52f1257bb4fef84c30616b8fe857841b859ca
font_01_sfnt_off000134d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 20344 bytes
SHA-256: 6c7252b464649750c4a2470cb82054a866fab027746d885415e6b959cf6fe8ee

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