Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7d977ddb6515a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 20:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a652fa1f6ec2ee8282878076f34f90d4 SHA-1: 5d5410d9f812b89a7e21e9ea1a5982b986f39122 SHA-256: 19e7d977ddb6515a004383fd1eed60205e8e00913f0ebef727d7696358797ede
164 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, many of which are compromised WordPress uploads, suggesting a link farm for SEO poisoning. The presence of a 'Download Now' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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://movimientofamiliadejesus.com/images/uploaded/file/nuzadisakezazowawisava.pdf In PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/90e9782d912c103e41f08438858c5da3/5451066519.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135a63e34b6a---32724239315.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/26912054804.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/wakifafasovime.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161413b9ae1f65---93228061126.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/91088400101.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/epfpjt0qbvu1p9a5331i8ffi36/37213508711.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3ec40f3d---8752802645.pdfIn PDF document text
    • https://lapakunited.com/contents/files/24931129452.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/25943546971.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/65720446871.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/kemomosujo.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/nekovupoxe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/omo94laavshs3ahtgafvlpukc3/rexaxiwamas.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/nuxasekabiw.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/getasatemasuniwela.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5c8b6c93---14218176012.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/91627189697.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/40589491614.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da55950426---rokabexuwefederudirodi.pdfIn PDF document text
    • http://skupka23.ru/upload/m/69192738465.pdfIn PDF document text
    • http://fabtur.ru/upload/files/43519961439.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcab25e3b0---xujewon.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903032327_1522024910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=student+of+the+year+full+movie+with+english+subtitles+watch+online+freePDF 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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 11504 bytes
SHA-256: 9688fa44c1be41d0e3530546aa2a74eb833b7ee87bb9dc28cfd842e7f56754df
font_02_sfnt_off000113f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F9 17640 bytes
SHA-256: bcb0a643f825786a7d1d0610b583e33f9d24ee01d72cb3aa4efa193ab89ce3b4