Malicious PDF — malware analysis report

Static analysis result for SHA-256 a022ac702f0aa9ee…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 09:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 460e7ae247e87a1e37cdefcc56f5f4f0 SHA-1: c9cc7bc0b5c87535f91cba05466e3fa0936828c3 SHA-256: a022ac702f0aa9ee357c93befe8d651faf411d14cff3c51c89fbb0e65f2976a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://stopserv.ru/files/file/59264183054.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610832da0ede0---62264459988.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7u4g8hl92o14v1jc86r2jo40ps/runidajog.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/notaxepibeti.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/vizuwis.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wokuvamufezaxeg.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/53855084080.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/4077982697.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2tqqa90bncf40iecussi5se9m/6834719930.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/80577066910.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1f9602a66---newesidus.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/947gear693mh8kb671q1jpmvi3/1273140759.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/luxodozunagibaf.pdfIn PDF document text
    • http://domuran.pl/files/file/niguxido.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/24450810053.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6974a9caf2755edefc55f4f70b21872a/61002612966.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/77449354555.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62011ebf49---matazelulux.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3d773e5f---6903464132.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/48ed7d86a738a0a3c8832ca95ab88f18/93833163498.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/tisemobatulumosuv.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/26229013603.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/8f5abea7b36f978a1d050ca9601dbbd8/34083827874.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4e31415b---7849301350.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/84757312614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=movie+scripts+pdf+in+teluguPDF 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_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 17204 bytes
SHA-256: b44a5a1d271c9063861096d3ca12f37bcf6a116851691415ef84086cfe2e33a5
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 10792 bytes
SHA-256: 21099e9f1386e7aeabba41becbf84caed2e4f2be199a6bfb35353f7a677d1dd5
font_02_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1