Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79c51c30ca7b7cb…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 10:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 786284c513f39a31d0ef2d10d0eaba6b SHA-1: cd3f5d610ce3da65b243bbfd4030c4b94806bcca SHA-256: e79c51c30ca7b7cb8355e65f2fecd859c632f339b1c18b8a01049a9439c528b9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure itself is also noted for duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afd076ad2---kojawuvot.pdf In PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/junikimuto.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/61049387663.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/gupadipikazamobevawapo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc4918f0f2---77130383359.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xewedowezovelapupaweza.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/birikibewopoxivupuju.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/gomekejutesama.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/83986606338.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32578868865a2953bd2e61e0af4dde12/57170253309.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jopajepisi.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/morovuwasanawomimutol.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/delizodatajigupilez.pdfIn PDF document text
    • http://hydrem.ru/images/file/paduwalixepofidotagugixiw.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8a5c8fbd0d1b83d4140b0b91df40b6cf/bipuvufaperapaf.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1f8601e8ea823cea4d4b085fbca5343c/46712502248.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a9af680856332ce469a9bc2bcde1093e/pulezigivasibu.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/gizevenevagefanizipinut.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4434cd4656---90348758725.pdfIn PDF document text
    • https://cncunse.com/d/files/wepexigijogazu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c87cd84e---vefuvuza.pdfIn PDF document text
    • https://w4house.eu/file/revutetogoxide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=book+trailer+licence+testPDF 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_off0000c184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC184 10368 bytes
SHA-256: 10001d44c49166eb874a9fa80bd77f081aa05bd410335ecf3504bd9e62ef77c9
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 17016 bytes
SHA-256: d2df43dcee62170fc20e50247c27f9be28936aa2b0547c3e8633afffbb9614d2
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.