Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e40cfbec23f95f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 08:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92943a03a195364ab29e60fcfd8e5d2a SHA-1: 9968ab2c886ca47eb65792d7a3229da7a180077c SHA-256: 10e40cfbec23f95f44a6ed6b3ae201e39a81d79d6fc1dd96105e6b1efcd93847
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 CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of numerous URLs, some pointing to potentially compromised sites, supports the phishing and malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://telewebmarketing.com/FCKeditor/file/6886201123.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9fd9a8ab---kolewezu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/40464883134.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/kemuvupawoxat.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/94008070460.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e121b32eb---2492598134.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gilavumit.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/48323840687.pdfIn PDF document text
    • http://salt17.com/userfiles/files/jirupofokor.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/bewudigen.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/51567536620.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd352cfbf---501849461.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/semisiginaperoxalez.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/biberusogenadagebawu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3981aa3e---51338024426.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/24696025590.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bf9cf393---33588827745.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/66196793666.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/95603441438.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zutunufebikuxifo.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/zofasinurebiwan.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tepegodoloraso.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xevap.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/lixakanuliv.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/39371046307.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/luwodedun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=desktophut+software+for+windows+10PDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16744 bytes
SHA-256: 54a4d67520aeca5c7a8dfa3317daa6f0c2e01586b6d96b4efd3708f8aa4da5ca
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 11004 bytes
SHA-256: 203560e0bea7e03b98ea55598d0fa4a291949cf37644e74b9fc1fbcf96a959aa
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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