Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fddb6dbda09056…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8220ead0495e2b225e9dc8a4b6d508 SHA-1: b44ee950f335452a7a55145d09fcb3797265fcf1 SHA-256: 63fddb6dbda0905689ffb71eb4e448d8e19961bb33667844f303369315e91776
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e2de905e674a1b7e3b1eff50a701300a/29028630309.pdf
    • http://reicar.dk/userfiles/file/namapisitesavetijir.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772beae6e41---fimojaliruje.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/065465cb7d908dda12b872bd07aa5e19/2680131105.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160786bfdddce1---18489780151.pdf
    • http://candemdientu.com/Images_upload/files/96503374483.pdf
    • http://goraku-sangyo.com/userfiles/file/kafavevapitefupedazapiki.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/tevagarokowapewas.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/73961113045.pdf
    • http://3bbb.fr/ckeditor/upload/files/nuropurabakupi.pdf
    • http://temple.mo/userfiles/file/29256208205.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/388f150765f12686602ba463c43b813b/1863759088.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21f0e5fde---retufuputopivavetupute.pdf
    • http://sva-jeanroze.com/xmedia/file/17845559358.pdf
    • http://akinmedical.com/uploads/file/kilavizupetogogapojad.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608480c505fc1---nizubunixizonuw.pdf
    • http://sosnovgeo.ru/userfiles/file/jijedukabomutopowa.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720904051a0---gubozidopurejowunozuweniv.pdf
    • http://salonorganica.ru/upload/files/mukaruj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160918b4a41d42---88113942046.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n7i3628s6br40olqmcu1k3558j/31241094798.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/k0q14cgb0894i7dfg1c7cb0vn3/ratukijurewepoz.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7e7cd43emv0kvrri616p7gl2m7/88792164274.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=horse+head+side+view+drawing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 16792 bytes
font_01_sfnt_off000102a6.bin
be28a913229439741f3646ea70e8aaf2cf4bd4cc1479bcea9100badb41b54b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 16384 bytes
font_02_sfnt_off00012d13.bin
4b2ae3c7829a766b72b667ee99f3d88cd8fec5be01d6ca405ff6fe6b47dd7d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 10524 bytes