Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aecd5e9efa25956…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 14:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 000754a8302218abc511bb55d34c094d SHA-1: f6fa1f4c626d5f52d0b248b871d2cb230921d1e5 SHA-256: 5aecd5e9efa259567c969995321efe639fddc42122e5fcbf306107c6ea4ce823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating a focus on exploiting vulnerabilities or delivering payloads rather than user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://msiutilities.biz/documents/jexepigi.pdf In PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/ginoxaraxiwenatajezod.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/22b74dc81bcf8d6d8efb67a8424ad750/96231257554.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126b5dea4479---zisedizoloxekupufo.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/82446368350.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/gejiwu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160828add58a3e---18186597588.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2d63b053a703913cd96a97448c6de21c/61130688900.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/padirokixawumasonejokigiv.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/77248832648.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/91702213471.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/fixebo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/rituvisujixet.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/56913272302.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/51697842876.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8ee0e904---28616985352.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/406598277.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/xadabaliwetozu.pdfIn PDF document text
    • https://seikico.net/img-tym/files/73503009952.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dt41anhevn4r20h4le784d11js/16144863592.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ddcc5758079---jebilotudaladuwozebuwa.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/mojexizudixepoderapefajig.pdfIn PDF document text
    • https://congchung7.com/upload/file/37525412792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=scientific+method+in+research+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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 10912 bytes
SHA-256: 84afd61e319d8dc1fab65d3be2f94ee6bd1b6d896de4ea65fa311b11876fc157
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 17984 bytes
SHA-256: aa79211e5e76223d4e66cdb15bf04bebc51d941e919a76caf52d98b143f4c80f

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