Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dfee6c8dc4fcea…

MALICIOUS

PDF

98.5 KB Created: 2021-07-06 21:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b064911557db3bb3b37323a1dfe6b308 SHA-1: f976921107bca42ebe638988dbcdd116331f277b SHA-256: 89dfee6c8dc4fcea1f21a0f9712405c38deb6d00df8a90a9ee30e039911b4b6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous external PDF files hosted on compromised websites, suggesting a multi-stage attack. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cytairtool.com/test/userfiles/file/20210620_b4618.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cbbb8810---23389161588.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nanixedizidewaxi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f956238288---65859285793.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4ad3b07c---35921463449.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/035f13934d7a592300262bcdb3559631/33577501151.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4373d3d1f8---75285939340.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f5a68ed2221f35fffb2ca003cad8a5fd/74824047861.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/362130322d5a3efadc67d98055ce9343/59026186070.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1b76d0ff---lanogimanobawebujedaza.pdfIn PDF document text
    • https://ksuskalology.com/images/file/libekonileseleraweradebi.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wilalanuga.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/spebcbadfp3cnmbh766g5n77a7/sixuk.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dbe3445e---totimedosigetutopazodike.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9474d077b---nirevutofe.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/457edbe06dae999c817b3fbbc45a1b4b/reripomaxovazegoxaxu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbe903382---guxugalipepubosusaxuwu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/sezovo.pdfIn PDF document text
    • https://actorconseil.com/files/file/zufivusokisewakewem.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/49512067352.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2e7aeb2a---nuxoganajop.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b4022df8---18053706639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=after+we+collided+sub+espa%C3%B1ol+onlinePDF 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_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 19116 bytes
SHA-256: 4c7463a6094ef2e33469a44456d657ede86482dc5a067f6fdcd4d0a1a50505b3
font_02_sfnt_off000160d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D2 11128 bytes
SHA-256: f7fd87c8b90219311d80f99e2ae533f76037e9c26040c090d8671faab81407bd

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