Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0c9eb46c640046…

MALICIOUS

PDF

89.9 KB Created: 2021-07-25 11:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c4c07d33e3d9f26796defb910c6f450 SHA-1: 329428d3310900c7f1e3048840d346ae0c6dee20 SHA-256: cf0c9eb46c640046f64f4dcabdafb8df4c018528a9b62b1a7901d4afd75c3656
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0a66217d2779cca32bd38f0be820a184/fanudosizawejezajanobo.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/s3fl9ne462m90s1dgrbtb88tgt/34887944022.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b3afb66b7---juxununizimi.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27825034008.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dosafipuwokarajote.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/86057350610.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/87ab5c4308f33ffbe6de0d4de9693a74/goxinopufutunisazuxu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/47275774441.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da53687145---wageniwijemewutegadifil.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/011413057876.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/2459383544.pdfIn PDF document text
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/21068818849.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/442197da51709d85ea0424db6fb34a99/4061214171.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dd8396b8816---zarosifudubexatapim.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/matopisaboxedusidonasuve.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/23842510643.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff9675f43---81725352643.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/82495047742.pdfIn PDF document text
    • https://icbacademy.com/upload/files/bizofeduxek.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/54943282012.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/surabosatojamivuruvero.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b09f955cd---wuduk.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c005d8c80ae---21964486260.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78219812598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sims+freeplay+mod+apk+ios+downloadPDF 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_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10928 bytes
SHA-256: bcecf3e2ca7fc33eab9eadc3edc82d52fae5745ac2c2f7a714e249350cbd853f
font_01_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 17764 bytes
SHA-256: 95c30affbc3c6a184c3ba4d9c6653df59439c4ea55a59ac4e2b5f7b0ab1ca143

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