Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab050c6d5e0b20e…

MALICIOUS

PDF

108.2 KB Created: 2021-07-27 21:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95bed21d95326b1a9a271801532084c0 SHA-1: a5d8eace58e0e7d07475a8ffabea11bd7a9d43fc SHA-256: 8ab050c6d5e0b20edf691bec84df53d971b7ae051ac92c51fb3dcd5c89075ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/smvbnu14pomi1vf6skk54sa900/4063513331.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-25/20210525174810459230.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/le7gb9p0p0vk7ts5e0o884e01e/76655016247.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/nosozelibatiwat.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/151fd1e98018d9f7d4a2b02136b9326c/bukizivu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607e00d677b7f---dalaleje.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/xarimunetegumodisako.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/29170870951.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/tumup.pdfIn PDF document text
    • http://stopserv.ru/files/file/liribasarolul.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ecc0ad80c---xudelepexibulokisewuj.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f516d828b77331d06415b4b9ba3c0a8/vaserew.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/dn1t2ecf5q79q5ib4n9fdb8f22/8524197051.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c7tr9i9g8m17f1j67dl4pbklh1/tazibe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/411fbeec92f6d196c03ecc430d842671/zubinarirolef.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b39bea1447a3046d247d04d7836f3c7a/59116985811.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/52b897694a4de06f1b57381157a61000/fupawomukivenirinum.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a507693713---32936161528.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/76867795878.pdfIn PDF document text
    • http://sciattella.net/images/file/dugigojegufosujudejis.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/18059481931.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160703cb18f4a3---regubetitirof.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/21apsp5bnd5pg2dm4sokuis0o0/tetavame.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/43298097264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=binomial+distribution+mean+and+variance+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_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E92 20952 bytes
SHA-256: 8ffa656b6fd59815b4484ee270eed094020c22a913f1482e37e6d9c990056f86
font_02_sfnt_off00018655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18655 11140 bytes
SHA-256: 001b667ea56200a2872e77109e297afd19f3f569c3bd0a5c791289718124a81a

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