Malicious PDF — malware analysis report

Static analysis result for SHA-256 0782b9b2117c5a5d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-04 09:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0eb770b535d76b611af969725742141 SHA-1: dcc2ad18022f7042974c87f8ea1463b38c78bac1 SHA-256: 0782b9b2117c5a5d5c5fb240d1bcdbf4e85464e95ddae00687aa906813f67a92
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e9fd552f---42064756555.pdf In PDF document text
    • http://briztravel.com/upload/files/8897205642.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/16755393577.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/mubebixadotemija.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b1a245cb4d8da2a2f89459cb66405ab1/43182013194.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/eff11c9eea99cdb2bdb998b5df1c825a/borisatotitebokizomepu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/2855119075.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/nopakow.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/goxibabokor.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9549b47c---duruxamaramadik.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfc50e31b---43732219150.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/86153332115.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/limikisunobaxamoza.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/modizebozazadamegugalama.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/58438471009.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/65508074615.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/zulowalorixisibi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9554765f6d---kolisapuza.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd330ccec---84828678233.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/2611130611.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4e7c3fcf0a65e6c2d0d042c4d7a32ee/6118266563.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/50154297390.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/burefisepati.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/21244975137.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ca8ccf6a9---95124919605.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4d20ccac365e67ed0e468d774a958aa8/24534247169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vishnu+sahasranamam+malayalam+translation+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_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 20848 bytes
SHA-256: 1180ecdfec67028fb67439d3514e0a89de61c6c450f6e2b855c5fcafb56b0d3d
font_01_sfnt_off000136c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDA 10816 bytes
SHA-256: aad09a5ca80475d55bc7e319a18850f4f3145bc6d14e6e1c456d974b793c797b