Malicious PDF — malware analysis report

Static analysis result for SHA-256 33018c3518dd1a42…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 10:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1cda6611c43a2e073460fe5344268f0 SHA-1: ed595df655a31a42882518a59ab343a17849a458 SHA-256: 33018c3518dd1a4264c3b00f4641f560be783f0150466d34a103adcaf1c4698f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files or redirect users to phishing sites. The presence of multiple unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071af36ae17d---sadevinilus.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e68383f83---sewatilidetosirefuzev.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5542e41a---76326664246.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kekezudusodigawuwo.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/lelapawizaruweg.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lulosadijeku.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080584c0ea1a---16364918321.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/pafinadoveresixebumoboza.pdfIn PDF document text
    • http://salkim.com/userfiles/file/66463784092.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/r3cbdh789sa5f28bofdvam8hm2/76796552832.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec02a633---dekekokazawakawunovo.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/96742365383.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d737bd7b2---pexamemitalaxororosefuxa.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/duposogenis.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc50087a72---nawoxuxuwunezikalunese.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8a4d98dae---13174900788.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/lademodasewogijadiluj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7da57d88faadfacd49d4337f308e7346/surijamikajaxujogepo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/62639937317.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160983fc6a0081---nizinimuwaxilin.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0d4no277fvr7gmccke3sg0b4g7/93881228292.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf6210116---88099855756.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e5505cab7c1a62e063013a530fe429cc/kokejokibasamuzok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=score+hero+hack+unlimited+life+and+moneyPDF 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_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 10952 bytes
SHA-256: fdd9af10847d628f84ed6c67afeaca6450b64c620e4ded369c40244ac7464b2c
font_01_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 18000 bytes
SHA-256: 87d44d595313e9fcf5f711c8407499cfb575ad24e36eb9117b194b86c1cfdcdd
font_02_sfnt_off000150ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1