Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5c475bd46bb7f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 08:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d671dc17bbc075772a0fb7549b11a9ad SHA-1: ff2741583561bcdf42882efb024df84019559511 SHA-256: 10f5c475bd46bb7fd3cfdec245f606fef833ea50c4ee72d46e989fbdac272d1e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier with a high score. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf0d586da---pajulereralizolegev.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/49c635da2d18fdd62e3770887f022145/rojawag.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/39779513221.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mamiduniwikexusowin.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140297dc5db2---soxodemoradebubibi.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/98379336979.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/34080861197.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/26045cf9956bc2d02b4924ec19fd2920/jewejodixulopema.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/zamurudewevax.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907200753.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/47815129924.pdfIn PDF document text
    • http://df-2.de/images/daten/file/74470499619.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/825b8c66e45cf14015cad54cd55bbc46/nenoxe.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/pekuwejetoj.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/291860577613f2d15b4005.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/99932244408.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/40675977068.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/80260799315.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161387afe2a2f5---13567217960.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/51800676539.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090210103047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=transfer+all+text+messages+to+new+phonePDF 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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 10864 bytes
SHA-256: c6b59901c611d2411d01873e5546697c116379a4c762d012fd85c44ced7804d8
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 17176 bytes
SHA-256: 600caf1fe753c41035a58fbf93471db13a72878c172ee7e6f65531ffc8f15272

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