Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8f81e86390af8f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-19 11:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 842609543fc3e0fb47e0cde655bc2cee SHA-1: f4edbbe59b180f77f608f2b201c79d0841ac9d74 SHA-256: bc8f81e86390af8f0ddc46dd0569faa864d552cfe8c8c377b3e0f4336ae2af2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the URLs and the ClamAV detection strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400ae1419---34270474715.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m19n3ihbg6ogdk5ke02atkn7q4/1132308186.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32227802914.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/batoxutukaviga.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a526e66d5f2---70322725707.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f2fce7c9---zenokasewave.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/68123770303.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b6080708---dapulevivajoz.pdfIn PDF document text
    • https://naoshima-habitant.com/26925057763.pdfIn PDF document text
    • http://ninfahartman.com/clients/d/d5/d5ac6782717b6a1c58177985440d8e57/File/24155871670.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/burewuxifosugu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ed3150f8636564d0b87e017d22f97de5/kinenawepa.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kewini.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/38be4e82a0d1563e57e85500f92436dd/zebubuvafinukul.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9204155b1a997317fde091abfcfe64ee/mewotegakevajuwif.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/22941579281.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/264cf67b602a391d9bb06d357e557451/tisezebozuwanuduse.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084559e7008e---60528545655.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/98294527151.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49390aabc---limubol.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/2174049788.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08b5ed7ff---14883829905.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e64fb658ef6737b7eed027c45fea1d56/54227940271.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/nozobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=transformers+3+full+movie+online+freePDF 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_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 16892 bytes
SHA-256: 187283a6cef3180cffa1a411ecac5ec8184f641c4ea398c7fc914eb994f6ae38
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 10580 bytes
SHA-256: b514f65650e5a84dd4639b9f1d5a034128a437ca5366db46afff9f9e3caa4db3

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