Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c63dad8be77ff9…

MALICIOUS

PDF

89.4 KB Created: 2021-10-04 12:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fb860932851e40a64e439112b2212a6 SHA-1: a7b1e245a06228c631dd8e35435f0a3d3f667971 SHA-256: c7c63dad8be77ff965e145e96c9fcba14ca4f874348bfe69e97e0647dcf8a9c3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=what+is+meant+by+privatisation PDF link annotation
    • http://rfaaa.com/UploadFile/file/20210929063235725.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901111301.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514fe49b5c---dezoxonij.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/pfl6pkd1svbvk9knq5a1d4sjkg/12900301912.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3d155eee2---34867192925.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/90254652354.pdfIn PDF document text
    • http://bankerz.in/qpic/files/87823367175.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/pagopupabo.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/vewafikirobefu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dda15a9643---30300901674.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588d73d0053---50200409568.pdfIn PDF document text
    • http://c-amc.com/upload/files/mimosenumonoxarudewofepad.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///kefunilolobililim.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422f0589e73---nonasuvujojoz.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/suzixikifefelubefaxiv.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410952a8bd1---jomulexabegik.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/56372420342.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xisosifara.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb5256eff---rebimixoba.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mebabij.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nosufetepiremufowizudev.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/89071274905.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/79560708520.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/44577014999.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/vejamuwolam.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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 18260 bytes
SHA-256: 3f7172a0b9ca97f11574762106c66b96f9b50bd7659365af7d2a2deb55c71e60
font_01_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 10784 bytes
SHA-256: 886c2aae7531ddfec16393e8ee050823aa18ceeb0bd9fd9db47b3918fc59edc7
font_02_sfnt_off0001400c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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