Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f329149c201d754…

MALICIOUS

PDF

77.2 KB Created: 2021-08-20 11:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25a0e601e72ec9dc9271b01e6d965591 SHA-1: fa40f71f4c3b5a23db025c495764e62d38340b14 SHA-256: 1f329149c201d754825094b86a13710c7ed4346da97dec187e4f79a0147dc4a0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=livro+ame+administra%C3%A7%C3%A3o+de+medicamentos+em+enfermagem+pdf PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160db6a6d696fb---73814054158.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sorilukopoxureto.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210601_594484BC0A6AEC7F.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mozanefef.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898a0f9ace1---51155948193.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373cd6527b---748479126.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086331657efd---wotekitum.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c9e5978---jemake.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502181512760064.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/18294373249.pdfIn PDF document text
    • https://austarpharma.com/upload/files/36826560315.pdfIn PDF document text
    • https://buka.ru/sadm_files/67224285704.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/95095102372.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/30186591993.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/nubewavuvoba.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb5c561c8---6517875280.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/51514766650.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80b8dd124---2915317273.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9239e4f8c6---ratijejodobelexaladitak.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/susinuj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/94036ec8da91d332b99a06802a2acdb1/86849644579.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0a8c0d70---pujojerelite.pdfIn PDF document text
    • https://baongochoa.com/upload/file/wipivujupiloro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 11404 bytes
SHA-256: a2c17e65d10de78d7837766c3238281bfaf69213fe76ab05f32dd4f899f73e33
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 18492 bytes
SHA-256: bc773244cf5d4e6e1faafcb95be8a966811a9e344c9794ada9c9faabb1dd5819

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