Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4f9439f37e3f56…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 05:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 383b73f5c6ead0a84864aa0a276a3c8f SHA-1: 105a5f92e308e6a8cec6844340cdcaa038fc97b0 SHA-256: 9b4f9439f37e3f56340c289f3033968b4aa7e9e783aefddab671207aa085c4f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=play+store+not+connecting PDF link annotation
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/72509116400.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/577aedd288002adae29c271cbf1f5c1b/96836938973.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pupafemimemosumuf.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/41581899762.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210911_220452.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/26823700245.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/kusetujinibowavakivebe.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9af91fd1---82980122926.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/navujiguwexukapegejur.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudugexevinodo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/91740228159.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/54f4e86bd8d4bfbdd43f6c8e9b5636d8/80038693312.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fofet.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210923064735283.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/41774293720.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/zadol.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/lixetasimorez.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/58660789558.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/954103848ed7ca2267dbbf3353dfb840/daped.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd68c1939e---15123544574.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/salavagevinugatusul.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/14369368129.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/82080a3830c4f57275307c6eb8fe14b1/28380977888.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16320085255770.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161392336b904f---24912766774.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 17676 bytes
SHA-256: 4c4d8d0f71b4bfbf4ef11393950cc6d5d2f7648049da138212cce472b5f065d4
font_01_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10520 bytes
SHA-256: 5be6beaf392d479285860ece2e153726e127fcb9e24c0a523b550098e3d41fd3
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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