Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1fad05eba1f9a4…

MALICIOUS

PDF

102.6 KB Created: 2021-09-04 02:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1513f7e65c7f313d764a9210cca3b38f SHA-1: adebb6bec04b8a9c302bce010e7b8a91045b8d6c SHA-256: ee1fad05eba1f9a426e0a79303ce005f568487c14690900aeeee257a7d7001dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9d5e209c6843908330a4c7eaf0d2e6ae/16925281959.pdf In PDF document text
    • https://zlatartopalovic.rs//files/goduzegivibexat.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a326afb2819c8f32310201f2094f6b96/befozobimubukof.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/40950068025.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbf911f2fa---21361459494.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/miguwavopelude.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/14180543513.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/musevaxatogofozebi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/eb92557e76516e0aa8579bcc407adf6f/25113679079.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/3299155038.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9a0f38dfed4fb5c2f822d90c536bc192/39557519187.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33ceb723b2---kidoveresikowutibusug.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/mapoleb.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d7c7917c250462b9e521907cf734d539/24532317767.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abd016d1e---81638751284.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/misobobugarezawe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/504be3f26fbb9078b08d9a36a0c3c6ce/83984445291.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zofuzujesomexolimimij.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/41103975602.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4079088881.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14aab0a80---12137869805.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eba7991c0---xabakijupiramizu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf60bd2a2---10816577607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=barras+bravas+argentina+pdfPDF 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_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 10768 bytes
SHA-256: d9a1562ec4d2095294290e7520340e012791b3c7a789c51525f6443155702fed
font_01_sfnt_off000140e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F4 20220 bytes
SHA-256: cafd8646291ab43b8fb597d7b08bb9a511d1a2afae140052b60bb3bee32cd335

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