Malicious PDF — malware analysis report

Static analysis result for SHA-256 951fd3ee858df242…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 02:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 772d547861368d1f37dbe8d990d590d8 SHA-1: de0ef86f829f5dfaef5e70ec44301ef80809a9a9 SHA-256: 951fd3ee858df242332465ed93fdac860b1c092b77fc5d70dffd2cd9a3121bee
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to various websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

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 https://bodykneadstherapy.com.au/ckfinder/userfiles/files/87785368834.pdf In PDF document text
    • https://ontogepszerviz.hu/editor_up/20320634104.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/6215408930.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac868cf19b---14414360877.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/92bb8eee07e48b42a1f22816b8480a76/sanurolobetovo.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906124809.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/xuguzizawoxexusawa.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/70931334247.pdfIn PDF document text
    • http://seamacros.com/upload/file/korawalakukexobez.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/75959146139.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e77812582---10538087829.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/57656152018.pdfIn PDF document text
    • http://savemaxint.com/files/file/85073529369.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/95bd635d590e2fa5abd35f27cfca6c08/bojedatapusibabi.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/63466236782.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363fa48a2d---83390264863.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/kibawiluz.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/votagiroduzikoramexobip.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac6aaabb39dce2dafe004f055efea548/kupirotadebatax.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109121235556141.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613141d4eec8a---xemorim.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210907_416338756250F2AE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=node+js+pdf+bookPDF 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_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 17592 bytes
SHA-256: f1d7384ed768ca3da1fa466ae10b7cf274297ab189cc80f7f0e907e71a21e0c5
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 10228 bytes
SHA-256: 0be01aadf5a8e6f6cca9970ea2b8493a95c9c5318886eeecbd9dfb2ed8f4349d

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