Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65de0e98960aa58…

MALICIOUS

PDF

84.4 KB Created: 2021-07-29 11:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1225c578c3765cb297b41f5ea067a372 SHA-1: 6c9db5a13528b16b91e872fb828b44bb54fcd79d SHA-256: e65de0e98960aa58b652383bb786d234b73f6e64e81cefc2912b1abf15fae93a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=automotive+flat+rate+manual+pdf PDF link annotation
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/198be6b53481cbdc9a5949665451b4cf/tajadazabijiv.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/disugowowusaselizis.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4d0aaccf4eab9254e21676cd29e2a3e8/20867168544.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wokejuzoresobevodubilux.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb67267ba2---38591778855.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/36269533451.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/603cfe38de29fad09f585ba5f9316bf5/8406186005.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/41544176418.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/winujixufeg.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rimawigodupepujujagomipej.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b702102c13---87489526852.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bisomowuwo.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/sipexijikexuf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df8f23b40---96138072343.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d7285375e8dcd8d441bda46528d7c3f0/61925255156.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c6eb84ef---gibubabutiruxa.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/sadazezigeramazoxu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa515bcf0---61959280211.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d7dd69a7---kixikepekurerala.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/64849722805.pdfIn PDF document text
    • http://abpaluso.com/upload/file/73015949650.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/86027750504.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/64626399691.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 10636 bytes
SHA-256: c15c32261e8e129326cb489e77ebe5869d0c372a6c921bbd53c8f0f923453053
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 17208 bytes
SHA-256: 0be07b589ba15e8ae608d36da3b3c46af631242d7380b0d622441c4a20c80eab

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