Malicious PDF — malware analysis report

Static analysis result for SHA-256 53615f5c5109443f…

MALICIOUS

PDF

82.8 KB Created: 2021-08-26 06:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fdf73604c837062c9079a9bb0b3adf8 SHA-1: 01e6c4552bdac55fa20a67bb299ad442afc505e0 SHA-256: 53615f5c5109443faf06f09a3f84aa011dce329ba9a66b888938849a6f20ad2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=story+books+online+free+download PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a2d13c6e---pepokadobukituvewix.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e61eb8593---nalipazuke.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///futowolalu.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/vukejuxememurilunured.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160931db10be0c---wupavekawavel.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f9fe4b69---fagel.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/firajipazidegoboro.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/7510243402.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb90d6e0d0---88230054553.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4663787af4c1cbfcc77d3839ed188eda/10169415453.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/74492249496.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lazok.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f0397bcaf35fd1ae9ae86b5562160a37/37597338113.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/dukoz.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/18139350446.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rgh4tdff0ho5moa9fk3lvtdf7n/68065714633.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ssim61sp3qm84d6g3l9nghmd61/14949190294.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/15313605827.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5fc573fa---64314617250.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80e89b38---1656501379.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jabatexu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/57024cd2e97f588d70516de81047430c/15426301232.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/44981116018.pdfIn PDF document text
    • 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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10856 bytes
SHA-256: 9ccaf9f527f13ca16f70fcd96fabf627685e3c50542924ccd07ce144efd81770
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 16268 bytes
SHA-256: 4e32f4d9f129ac943a2b66816e9dd4fcf21b36b4b836a14402e7c186d2063a95

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