Malicious PDF — malware analysis report

Static analysis result for SHA-256 387b5eefa1f0c94a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 02:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82f9ffa04037fe6e54f6601179c544a1 SHA-1: 55d82ff69d31f45f7186551e8b26d59d5dc13259 SHA-256: 387b5eefa1f0c94a3ed49bb9dc5446da13ed12b1765bfa13e26219542822b77f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://teechart.com/uploads/images/files/wojuxorizagobepabu.pdf In PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pijojuzuzejadej.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fbad261e06e351aae7b1987b52e7e116/zagakixitelevini.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905dde59587---xemupabejafofaxagam.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/66912256805.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/bopun.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ff09d82e---bapajaguxatepofix.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/62670489004.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/nebavoluvumom.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980364e60a7---19805769763.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39a078b799a42649ba61b98e32eae255/68590877051.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vegujiwadexetoboto.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/nuwatinoren.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/54679072597.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4bb1b112---viweni.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sitotijimetakoxibusovaliw.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/sakekonunewipofodamakimab.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/joforojeteduvenomodab.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fvhkpie7i7kne7jtl5k2b718jk/nokuwiki.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/gotogogelawedudowanaxivur.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fagizejelumati.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79d5399af8---linemunewajazudadile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fillable+cms+1500+claim+form+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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 17336 bytes
SHA-256: 6944fe06b314d9bf5138b67b22ae7b907706d6eb34b4ee29be5b6e9528547f35
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 11004 bytes
SHA-256: df4ae5423887234ad8c0d7bb522852d23227a87f70734e1bb8ab231d46aa3ca3

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