Malicious PDF — malware analysis report

Static analysis result for SHA-256 6daed31bc17ef147…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 03:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f57fccbc86ca62de57ce765b9287c02 SHA-1: 64a730e49dc0e7294a5397218486a36c5ba24519 SHA-256: 6daed31bc17ef1479281f057661b6463aada3f9598cd1230a9d424d93f457c87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=dolor+y+distensi%C3%B3n+abdominal+pdf PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160be8caa94296---nemikobarefovojap.pdfPDF link annotation
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f90a252d01f5682990f9c3fbb3484a81/belasalobujogamubiwukuje.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210611102454121.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/39404074102.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/begolepamoretunazujibokev.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j3es2t0k67r4efjn34j8b201dj/33956778806.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/58807889054.pdfIn PDF document text
    • http://bakoca.hu/files/file/62371401221.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/10217434104.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/lepewejosufema.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/264e23a233bacb7cf0974743ba91ff8d/25349353468.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabbc63ffd---gopojomerawo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xumuzalapezuve.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b497620bc23---kuvubi.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/17363714193.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d883c9e9b1bcdf4749bc746d4949eee8/bezemiluvefagaz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7s6ah4sdvbhoehdg0iphjqpvj7/60489841778.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/99919354136.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/32006e3ab714d896d2f15cc28f2ad40a/sikixunujaxedomafobufo.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/72912198387.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/18140733484.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b733923f---57637618154.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/jipidonimitefulara.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519012445480031.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/21552393866.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/bukopuwojemewu.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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 11052 bytes
SHA-256: 71a4fd6eb200cdb9ce910b10c410e253136a751814514412c66ebf202dd74860
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 19296 bytes
SHA-256: 78d09cf27e22fd312436d0c4a1de5429b35b261e42c560b350920522dc783b21