Malicious PDF — malware analysis report

Static analysis result for SHA-256 274813931e2fa8a6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 01:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a02b07cbf3922abee70bb60951f54419 SHA-1: 3d4f77a4e9115dd0590867dc5938561a2cec43dd SHA-256: 274813931e2fa8a622fd1b54ee40a85624b3d4d104d9571e076e2d66208c2796
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccd661f58b---robodufirebuzififide.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f4cfc4bd546f9c62745be1d339715cfc/51288137289.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/zupanevufibopijenimaza.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/lajisositokiz.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/759a6a0t92dfqs4nfk1tnj49p3/41272722644.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f9aad470---53971592992.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/njbjcs78ofnegg1bsmuu00l013/riwalemijis.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111577244c---98696722048.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/38897679700.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/kudakena.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/9480695849.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160edbea1b6fa5---wujimasenurumeruto.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/sigorigulazawupimod.pdfIn PDF document text
    • https://go2germany.ru/files/file/fufifolarap.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071814220356.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db083f191df04d7fa4c130562f59af07/wapan.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/zajexusumojebipepavu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa36e0f284---81959954717.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/45039694422.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/1705914888.pdfIn PDF document text
    • https://davaocarrental.com/images/file/xeros.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/590a62bb34953e970982194a033e1fc9/1359134507.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zarirezuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=upper+intermediate+vocabulary+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_off0000bae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 16872 bytes
SHA-256: 12eaf79026b107dc21157d248324d275fa9e837e3c1064c7bc4376b95c616e9e
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 11040 bytes
SHA-256: bd57f038abc00f7bbfbffc713525735df3ff5debaa340f0dd490cce96b5e9b5b
font_02_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1