Malicious PDF — malware analysis report

Static analysis result for SHA-256 b164bea5cbdcfdd6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c2f8e010c79940dc7066ae040e8a86b SHA-1: 408ed4b5f5320070cf26fef076564e8c0b6ad9fd SHA-256: b164bea5cbdcfdd6ae9234f48105c5973fbbcc72ee9faee32dcde53bb76c2bab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://tdbakademi.org/userfiles/files/71008815105.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/80145972056.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/seziwowigudujisaso.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fofujonegita.pdfIn PDF document text
    • https://clickbox.ro/images/file/15822470553.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/sinukusugiwinudim.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/17495382372.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/gevupavob.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/kurefinixurubigesarebepos.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/valutugevesunamorisido.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/46227747557.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614904cab9140---vibabosusorajojof.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1dnqsscsvbesbctcm76c2jfbj0/wujajulezesajadu.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sibixufidoteju.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a5707532c4306120d7f7454bfbdfaf73/kaburexofuzopuvawipa.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/29266624467.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/13787809788.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/wexukibem.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/juximur.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/93e40b7e849be80f343455b3f582978e/78769120172.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1160c3f3---32626577399.pdfIn PDF document text
    • https://motoralbini.it/files/file/12222045035.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e0d88b84---fakutivagewomenurare.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/xizomegedokil.pdfIn PDF document text
    • http://snft.ro/media/file/buxatuponunerifodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=playman+summer+java+gamePDF 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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 15196 bytes
SHA-256: c45b371d7d121c3adfe850fdd20dd7831bdf886448e325c7352eb17142637703
font_01_sfnt_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10552 bytes
SHA-256: 51f622aa5a87e9fdce8293a2dc7e89f61dae468c3d8a9be8c923d5c7b7d1f7d4

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