Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba10c4f68c12dc9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 666d87e5ddb1dba21fa4a4b890793bc7 SHA-1: 0cecdc9d9fd2ea93810358227743322c918de635 SHA-256: eba10c4f68c12dc93449e0212a98e383c9e916843f384eabc2fa77c0e161c92c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The primary purpose appears to be redirecting users through a series of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3d448e46e739d376ec5eac2f2e58bb2b/wadimodobinerasozo.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/sifipenosovabugefam.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zobajanepafopebuvexodobom.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607634d827e85---77660980560.pdfIn PDF document text
    • http://goref.ru/files/file/geduwubonoxevigutenonax.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/tifemivuwixolot.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cad911cd9---24340411236.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ab62b88f2d901a2dbd3ab2d9ec8c345f/sanikutoni.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/65729958221.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/db5eb8ec9c05ac6b42e747e1ef3a62d6/jeloka.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/31054847723.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbbf49613f---15480349273.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/11112935282.pdfIn PDF document text
    • http://rsentco.com/upload/file/97229632938.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/febewufudibavenuvometika.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/33428818870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c772f2a7---kaxorapunorolosuxil.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/momawu.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/92658131515.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/fogifubut.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3675cd66---sirurivarigerukabojeka.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/83d2a47d913518d451e752c0ceae64ef/43645366542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rewriting+number+sentences+worksheetPDF 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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 19276 bytes
SHA-256: 83e221938ba95c673ec142e044955d30601821fadb42fb845950594f99eb697b
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 10932 bytes
SHA-256: c7de6096f6043084afd37ac0c3f8b02dd81c359f3648c2432a1c09c637a0e074
font_02_sfnt_off00012dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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