Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9c72b3ea95647a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 13:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0de23c700dd52f1200ed325f32a83455 SHA-1: 6ca0442fcedc29a28a5b2c57173b41c3d688c096 SHA-256: bf9c72b3ea95647a381da8dd6c08ba88c85186641f3dda61331878dffaf5e33a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nslogisticservice.com/userfiles/files/zawafar.pdf
    • http://zentrumok.com/userfile/files/luvokafefamokapik.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083214b22588---45772675888.pdf
    • http://sugarfree-gelato.com/upload/file/70607978341.pdf
    • https://areicon.com/images/file/vekanuwopikonibixas.pdf
    • https://vansuloi.com/uploads/userfiles/file/zeboxerakokukarineluruwok.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5088e7d708---45065157933.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/3ffde8bbbf5bb2d6f953fbba06ef4afd/24875879786.pdf
    • http://scheidenschiedam.nl/uploads//file/mukobovaxurud.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b8baae64---57035411386.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784b667524f---79591796280.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659d910b44---96684391150.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adebd6a3f56---duzexanudadux.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb2cdfe31---dewusipez.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/v85ej56ett9qgs04cgmev6qkjn/18853952612.pdf
    • http://littlepearlspublishing.in/data/eimages/file/tokobu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea3f7373f---gefikelaverinerim.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4g92a36m4gtb65badkjhegkdq0/wivofuxedexetaxowabuwe.pdf
    • http://kaupa.cz/userfiles/file/95745743203.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/liratikegetime.pdf
    • https://mytopics.it/uploads/file/butobekenowidipas.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871cb9852b5---rirebazukuridubodog.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4524ec7b2---zujesuwa.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/aefa8755865a9107cd85576c58f20a52/23397855654.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pray+for+your+future+husband
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f806.bin
fd5af4ccdd23227f313ca0cfcb9ef4a2655f21ad1ef327f0e9b243efd841e21d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10888 bytes
font_01_sfnt_off000110ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 16792 bytes
font_02_sfnt_off00012911.bin
fa5ffa0f4edde02678a0234a0e5ff7164497d132c469e6ccb392b25a05842487
pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 16856 bytes