Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ce41fc481e48ef…

MALICIOUS

PDF

105.6 KB Created: 2021-08-07 20:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9ed8457a972b385dff7aed54f638bff SHA-1: a623da58ee105d4ae640ba88e191ac89a490b9cc SHA-256: 21ce41fc481e48efe479a854c3401607ee0f3a65c66658da06ae1a616f5c556c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload directories, suggesting an attempt to trick users into downloading a malicious file. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • 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.
  • 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://alltechsro.cz/files/futuzigajurafowoda.pdf In PDF document text
    • http://progfin.pl/userfiles/file/gekuwulafawameduloxivu.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/70a015534946132227a8ac9f01bad2ef/75171948595.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a05da69c625549427a69cd5c5785613d/30970084449.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2d47dba9---daxedagodako.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/19687977642.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/tisovado.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/3437513024.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/kovonufufimaxikativozek.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/87889893245.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a83c191cd10d329f8dd18e01da459e65/45538446771.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/57878720804.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/16054928848.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/89670236514.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/lafuroxapimujafadijanur.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/k6gonu2o3j613hfoc6rcsus463/jusavokota.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/14301583689.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3dfcb86a2bb53e8f9ead94c2aa4d53b3/degodoxijagomugi.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34313615639.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/usma7p643ua7ldbe4ra7io6g5f/tonaramekibutarebod.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29de2d313a---88925039872.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/hemncfgaqd4t300gla6duq0jjd/kazipudexedipatod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=wrong+turn+5+full+movie+download+in+720pPDF 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_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 17216 bytes
SHA-256: dda993617dedf9995aff35f0b094f031f775a86222a9a403898345baa73286f5
font_01_sfnt_off0001646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C83 11344 bytes
SHA-256: bb4fed9355a4c9fee858481f7e0cd00626c99ddedd9c3457b32706fe2e56c775