Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fb2dcdf99129bc…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6ca081351754d961ab76df6d3d9a2a5 SHA-1: 3cdd11ab7ea9e35889a17aafba1f45fae75af2b8 SHA-256: b0fb2dcdf99129bc228ca14afe74e2eba268b47dbb713eb43c630a3fc1a84422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the malicious intent of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=salvation+proclaimers+anointed+church PDF link annotation
    • http://www.deopendeur.org/imgUser/file/gapipufofizexevanok.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kuwupejomize.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75313422b7---36849715151.pdfIn PDF document text
    • https://afayl.com/userfiles/file/58477940226.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/juginizabiz.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zezisumata.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27479016---kijorikiv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fee4e5210---94688949015.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d460e66966---wonatolisug.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/robewepeja.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160922c61c15ca---tomavupuge.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d96720b06d63860d062badce17a23c7c/gewarosegitukedogumav.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210705_852B3C30070C23CD.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/97447995502.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797ba5e828b---99769710296.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d90be1d72a3a262e37093a1cdc10c55d/25154437520.pdfIn PDF document text
    • http://mesterek.net/tmp/65455437870.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/setegipuwigabelerik.pdfIn PDF document text
    • http://flexicourse.cz/res/file/24384889768.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/0u21k3nd6lv5tgt5bdoeegd4u0/76516042897.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/92421089469.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3141ef2981---71590689879.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9527f068---biwidelegowal.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/98663020355.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2900c2376b---7135899232.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b2a617efc74---viberepesiratujolo.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_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 17912 bytes
SHA-256: 5bc90be1d19f3dc4b5c1c435b33d04fbd8cf42f98a6a8396e4df08295fca4dbc
font_01_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 11020 bytes
SHA-256: 516dcb7c2a8a99e80d873e3f207ccbbe83f5fe5ae087c3598ebba69b7146dc42
font_02_sfnt_off000147b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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