Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9d8a5d239ecc3…

MALICIOUS

PDF

99.9 KB Created: 2021-06-28 09:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc811ab9fd18c1ae619731992ae26a49 SHA-1: b8b9d204a4685cfa903e4c1bdd31c1466d37fa3c SHA-256: dfe9d8a5d239ecc383b8989c24edfd593cd29da69adc8786757434d33d30302e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to mimic an invoice or payment request, encouraging the user to click the provided links. While no scripts were directly extracted, the nature of the links and the ML classification strongly indicate malicious intent, likely to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12c06cc9---92664297628.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/3qs7hugh0c6jp5celsgevd54ei/wixibazovikubi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f8c97973842efbf50e4ecb667af78cd8/wugovupi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/pulasalofaxedizage.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/24475265466.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/83374786306.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/4178209131.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/14420379cb22c076710568f38d2b465d/kuxawavazepulen.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c440db395---36619518848.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092eebd64c06---tovulefuzosidimatinome.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b981bbb4f05---xazematuwisimifapuwe.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210622224708.pdfIn PDF document text
    • https://tavio.ru/files/file/fukavagoxuludap.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bolewekerusilifaz.pdfIn PDF document text
    • http://beiks.info/public/file/62008308387.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ebf98dc9f94b560c77d6f5d76f24194/66866730628.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/fisujitifobiri.pdfIn PDF document text
    • https://csodamalom.hu/files/files/2894431006.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/povakezepezofapibagapegil.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b3a51e3b9b7b49f7315889c6a129741c/7260269590.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31f8b7abce---86935588709.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8b416215---64324309184.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/13127707491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+gst+json+filePDF 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_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 17760 bytes
SHA-256: b3f66a0d3b1f14b8bd7820870fbfcb41fb98242ca361641f3e6e56cda6a5cccc
font_01_sfnt_off000150b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B9 10476 bytes
SHA-256: 1a8c4363babcba065fa640ffaec4c01202cee503a3cbf1bf1e8afa12b87edcb8
font_02_sfnt_off000168a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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