Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c73a7b925a6620…

MALICIOUS

PDF

101.0 KB Created: 2021-07-27 18:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: eecdf64414b6a0b0881d8153c798d519 SHA-1: 20da422df0db41bc0ce1f72216b66446797660ce SHA-256: 63c73a7b925a662027ddaa6fbee85a9cea5d8496bb1556427df75e29a26f548e
180 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a lure to download further malicious content, potentially for phishing or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733bda75c7f---rowunobopizizodigur.pdf In PDF document text
    • http://sysquare.com/UserFiles/files/jajawojugela.pdfIn PDF document text
    • http://vtaky.sk/media/file/golovadojuwezavim.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kmjlpvuckmelcp3n8g6j4h5vav/wixefelakaw.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/parapevozal.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ebf8e8b84546d4d09731d1990d1ba178/76309097173.pdfIn PDF document text
    • http://iphysiology.ru/upload/gafapegemurixifonewegofud.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/25056789450.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af04c9af0b5838a6d7de0ce5be176175/69928315560.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/70209680350.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/98904055470.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160963c264df64---sumerer.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/1986216459.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/pizasiboridedepot.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/jizutukowetenam.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071db3e1000e---pesotif.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7fb415a0c---sividukikevaboduzeg.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gifeb.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1a1c23839---51969508326.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d002914c78f---77464511547.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/nufux.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cf9dd7a19f4e2b8983c60254ce70dc75/50709830473.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bibum.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/58431635290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=movierulz+captain+america+civil+war+telugu+dubbed+movie+downloadPDF 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_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 11132 bytes
SHA-256: b90cb4536aa5a1c2050d1288f652891e7a8cc52707c42250a738a651ad84c3a7
font_01_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 18904 bytes
SHA-256: 0770b2896baaf916d1ce21b252177117fc85d07709b66199b79812a100e700b6
font_02_sfnt_off00016af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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