Malicious PDF — malware analysis report

Static analysis result for SHA-256 822f85d91287b458…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 21:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c23c2e0c1aed358fdf26f7b8b9470b5b SHA-1: 7dea06bf3ab84806e14bc0a19860582cf715946a SHA-256: 822f85d91287b458a21188b65094f46563f664d2e8a20771c5f034ba6f53ce5d
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 0.9973

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://indoshaolinkungfusociety.com/ckfinder/userfiles/files/videfosofexuxokadejo.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0477bbf26---76714849187.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a2b8f6d3761cabcf961ede400b83b8d1/tevapavifuxeledun.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/56914906103.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737bdab9edf---61298400839.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/sopoxusipiroki.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9f750f28---kidekodezowerogaxaroxa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95888c53ef---fopepefoxebupobameregamex.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e60b48d8af---dadotad.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/50694897377.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/1960063099.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c444bda18fc---44179645453.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/savaveseg.pdfIn PDF document text
    • https://e-midas.ro/files/file/64580303599.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/30945065278.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061008161173499.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e320cf7c---javerasipibemegezawulaka.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c079e33a2c980f54a3d59088bcda458f/zunatiwuxa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a5aefd48---88512423758.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6bf071bd6---kozitezajewunowifatase.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/sulaw.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daabdab7a3---44078255050.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rikorovikekogibinopixos.pdfIn PDF document text
    • http://sro52.ru/uploads/files/sinatit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=convert+ms+word+to+pdf+with+hyperlinksPDF 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_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16976 bytes
SHA-256: 168bc765ddbe2d5438b243c0c2a65e8ec3ced648b313544b8039bf74063b4a47
font_02_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 10992 bytes
SHA-256: 5cc2217e13cce1bb0ca11dc0d669d9a571e4b962508f41cce1fe9e83718f0af8

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