Malicious PDF — malware analysis report

Static analysis result for SHA-256 850178e927124d6c…

MALICIOUS

PDF

91.6 KB Created: 2021-09-08 10:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 905e75e0c9ef8d9de434705424d9aeb5 SHA-1: aff99ad30e1ff35338dfadbb3bb4d2b7e9111381 SHA-256: 850178e927124d6ce92f16cc54e79eccf8d7d83ba50f6f5f39237892c4cb0c87
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users to these compromised sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88cbbd5e---diratidatimuvikerigamubi.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/91525011242.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/81011353938.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/sabudifetuz.pdfIn PDF document text
    • http://rolcsi-bau.hu/userfiles/files/86088667115.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160866760bd0a6---58135306415.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/64389917007.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e1707e61492d41a508d2d203861dd0e3/duginizototol.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rsh48da1g5dhdd1e4bkl27h8ek/90278456162.pdfIn PDF document text
    • https://jetaime-shop.com/files/pufad.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/29832881712.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/qpklomfm6kpveedd4c3d3dk5a4/63735424849.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b99790632---vuwujimugugesuromibiwolu.pdfIn PDF document text
    • https://airshow-bg.com/file/wexipedu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/5090424495.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/66144362181.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607884f331ab5---sadabiw.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/041342075413.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c4a6ab35840f43bdaba0879d437d540d/67620260113.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa868aace5cc95e7cbdae33aadda8656/nitejapifalajogale.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/xetozezeworupu.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/54b2baae9d15dffdb5aa4aa5ff57e4a3/riborepotatabe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab1d72470---sokemujamuxapuwovexukexup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=elective+affinities+goethe+pdfPDF 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_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 19188 bytes
SHA-256: 58e0c89a263783ffee9710a97bc53b0eae5d3565b120330e72bc68190d6138ca
font_02_sfnt_off000147dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DD 10848 bytes
SHA-256: adae19e7f2d9908795aac4dfdbe3fcfaea49b08767022263b6f27612fe2c940b

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