Malicious PDF — malware analysis report

Static analysis result for SHA-256 44be09bf6e48788a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 19:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3964ffdf95d56b9f1be228159f3ea709 SHA-1: 5d934a0f89b7ba8162d631b14d408a183834d1b0 SHA-256: 44be09bf6e48788adef4cf54a29b957f00b01d8a9d6be799730768f1dbe466f1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://self119.net/upload/userfiles/2021/09/files/210908072432.pdf In PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/73664420086.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/64776089314.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/62845512041.pdfIn PDF document text
    • http://cga82.com/admin/File/mefejotekatowexiselunoso.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/migevijajowuj.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/pozidined.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/28cf200d6fa3a3f6a2126900c3f797c4/wegelopodu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/petonisolowe.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/zodanuvaziv.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9d1b3986---nizexezetebipiboxofiwu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/65085553962.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/70387987214.pdfIn PDF document text
    • http://tcihk.com/userfiles/zufebobowowojumeb.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/49066249779.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/betotibiwadojinez.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2fb01a73d---3599379355.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a8d2fcba---nakulubawejevuduro.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nitedarokivebufifowa.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/969103888.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/vogud.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/sosobefegimiwagolinafizox.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pumimomovuxegufuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+lay+a+freezer+on+its+side+to+transportPDF 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_off0000be2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2A 10796 bytes
SHA-256: 080d745eb15f79eacb1a1daf9d76c17de90b91c5e5a02e801985aff062e9b3ba
font_01_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 15300 bytes
SHA-256: 71e937738f7d7cc7855ba3b52ef6b76795fea7a63f245d0cb1547e360c6807cd
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.