Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbd4cafb7f948b7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 07:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d89928b262162ebf81097259115e51c9 SHA-1: 9f6d09d5102cd84013a9a22c89680a51e5854e74 SHA-256: ddbd4cafb7f948b76cc25918d64fea0887805a517f9eaaf8fa2486892b8ceadc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF links and the use of disposable hosting suggest an attempt to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://weighlessthisyear.com/ckfinder/userfiles/files/dalewuvurimezigefutomuti.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160835d8c67d3e---bolifuga.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c0156df5754ecf22f89cd08cf55592a3/posokosifezegike.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cc9b88d4---94500075803.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e40c1aca541a972bbc30023c8ef07904/magikezejikorefofowevefe.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/86055676635.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/16207045634.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hgb17dful012t45nsrsbuteda/javiberadiso.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/41817f72c75a9b823ac226aeca0f10b7/32506930929.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/lufasiw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b93aa1261---weludisafofatab.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc6107c2a6fa3ff6a86cabf23f87093f/vebetapezemesefaxe.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/togabuko.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nolevekakudaboto.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/sughi4sjhgi4eia50ebs20t8f6/kiron.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/28d0024e84ffe24282dd54a57cc23ba9/34931453830.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/30ff1920a74717f0c4e6a27d82b1ff4f/nafubanapiwa.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/402fe76d43dc1e569df16b7cfda85971/tejuwelebado.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/228826da42caede3397858a0453494eb/jaxajukarujilifa.pdfIn PDF document text
    • http://sakem.org/userfiles/files/52874609583.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vilevonatiwokosipilok.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tusajukor.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/xagusasomelarelojel.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3a5012fc6ebda21a8157a707c2bcab42/42286456052.pdfIn PDF document text
    • https://123natura.com/stockages/files/piburufotog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+manually+pair+my+apple+watch+series+3PDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/xuzumezekib.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 17760 bytes
SHA-256: dce6a6c1ddaae982e05074971426931cb4b1b43561f7839f797fc85f6ef7ab65
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 11104 bytes
SHA-256: 80044fa3e8beda8a52da93be731667d66f5dbf9708186409496c4fdbdf6dfd4f