Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aad5fdd53f741b1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 18:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61f6d5f3b5c1e5c8bd551237bda5130b SHA-1: 7436a8a99b1f3720b7fc0788ec41539b78124bdb SHA-256: 5aad5fdd53f741b1c6269aa6625b15309250848fee845e54b10af7a30e80016e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8e1fea0a41413a9cb8ca58de46226917/jidok.pdf In PDF document text
    • http://cosmikkino.ru/sadm_files/dubudojapovowuginowadilud.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/35321700159.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boluregijaxite.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/31388565219.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wedajevib.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/warozejanapixegevogenulo.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/42445226878.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/72207010503.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/nutetanumegerosogexisis.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o36auour5kd1rgmivqsceahtva/73528247972.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sl3jd1pt8i6col523d00lqorea/kapeg.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607155ccdc047---74833767617.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/mukufuxilulubewekeb.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wibir.pdfIn PDF document text
    • http://cecev.com/stockages/files/kexujoresorifuf.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/63148896498.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/begifagipeso.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ngcm65bnput317d5hu0lilau5q/jorijimozepagemerol.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jedikuzupugazoxasewenuvak.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50e21c53d---sebuviwuvofefod.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72a9183e5---37458177418.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/jufosobukod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=steve+jobs+quote+stay+hungry+stay+foolishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 19140 bytes
SHA-256: e052258733b6da87b5614d751f9dd33167b7fdde5677de8a4923e65258befc9d
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 11264 bytes
SHA-256: 5ee39c0113a9c8024e3de290b3d65dbafa2c71bbf8bebe2f17577435ab5ea1eb
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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