Malicious PDF — malware analysis report

Static analysis result for SHA-256 95130d95d9b6f84f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 04:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e16d5e1baa1077c4001613e7e85f74e7 SHA-1: e21cb0b5298ccec6e55060cc806bf579532c735d SHA-256: 95130d95d9b6f84fff0c51391d832d58895dab9a28eade859253ddf96a207c93
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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://pistant.ru/uplcv?utm_term=kanji+look+and+learn+workbook+pdf+download PDF link annotation
    • https://sandp-engineering.com/ckfinder/userfiles/files/gowazaduretipimotixupi.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/12362481081.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0llnckc1puc57l60l6u62tucj0/dodifodusoregefepe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076dfe898c0f---58344865327.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/lowozitumawitoxike.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/wowiwe.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c43f30f493c4edc5eaf66f7de811ed1e/74094952173.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d2eb0940---25768905170.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/67307993378.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kukif.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada6ea2745---felamesawegedabu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/fisulifikifobinabiseb.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mrrumngj9fvlo3rpnotk1sr2v8/53812540942.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/pepogodapigex.pdfIn PDF document text
    • https://domilot.com/uploader/files/gadivodabemimimuxofufaz.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/66553154528.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/68868300989.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/59635930905.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/numidibezojarodufamujap.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3ca110436---sejijubatokavomubizozedum.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6jilhu27b605kshoa1qr4nrif5/vuvarigokatudi.pdfIn PDF document text
    • https://scalper.ir/data/files/file/10235784344.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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 17824 bytes
SHA-256: 84ce2a0627bee2f82f25a5c6b0122c34976f323f2b832a94aaef838d7cf12fb7
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10664 bytes
SHA-256: f66581b94b89a61f04da2c61bff814c7b0050c9aa32de0972af2f109fa5dfa5e
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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