Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d19ac36aabcda2…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 10:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 85b393c694de15f43a64b572217d32bc SHA-1: 2dd57c2ca3ff9f2b7fc4319c124645b399c1bfcf SHA-256: 53d19ac36aabcda2393023f6ec61ef59e1142f899c5dc49b3e1a7954e105f467
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a 'download button' lure and the overall structure suggest an attempt to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://anhuifan.com/upload_fck/file/2021-5-30/20210530012439230208.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb670d9696---68683069216.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/50786143338.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c2a3a6a5317f8334ce45abbc0edbcb6c/vejamib.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/26232808964.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/lasafonopifexufopad.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/35808444711.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/zifodizijibuxirunoted.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/54910120437.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7304895ee261d74e82de7b755765a99c/58299124747.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rokijisomanobanasixatuzus.pdfIn PDF document text
    • http://palami.by/images/file/bejorasesa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea9825f43---89322863233.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/rulirujomexolorolina.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9dde4217f05ce769bd3f9f309efb5e8c/vamabatejokalukizafep.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/bixabesewukexol.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809605c4ade---pavit.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0ea17fbb---30370233719.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601091110.pdfIn PDF document text
    • http://goref.ru/files/file/15311357851.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j005b0aessgapos33agh6vg9e4/68926514779.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fetexof.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/65556022708.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba1203a67---25864350328.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/pomatilabozivafetuvine.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99afd61fd---veneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+pdf+file+into+a+web+linkPDF 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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 10700 bytes
SHA-256: b59f0e3b2a4d68fa72a357f19d24b8a973388c9fef13825a213642e178ce779d
font_02_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 17100 bytes
SHA-256: 14edf1d4f1ad31d5380a592a889c35121ad76e11a711abdd15eb0e8907c24e85

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