Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e8d0727cb450c9…

MALICIOUS

PDF

102.1 KB Created: 2021-08-07 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38ea879e75870173a3f910308f3bfd36 SHA-1: fd96b04f779429ed07d17bb84a24218d4445605c SHA-256: 31e8d0727cb450c9e4ff32dee9252b2b90a3e63c4951acc7ada449ff10bf2960
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ka451rqtsdai3rvl1pgbalsdg5/visixigupomisejibijo.pdf In PDF document text
    • https://manorhair.com/uploads//files/202108040758176704.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/75192994896.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/rixatadebaporemod.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/91542293146.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/bojemif.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/52428290000.pdfIn PDF document text
    • http://pandoreunion.com/clients/81456/File/33470323912.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/83967258543.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262873f1c2---12590742520.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/xizekilunofanipobuwi.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72a960f00---34561722080.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/furamenakop.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/32f97b33f263768c42d417e62462c414/zunarikawusego.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16109b2d24ef15---7358463636.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lopoxonifetewosizepa.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c4e8081937141cda420835192663662c/7704664337.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/af606e3669c0429cc981ca1d81b63f8c/fekuxosunipi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/334b0c79a5d8fb37aaa7463ce3a78f86/lixezusesu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c575d6eedad---93661364682.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f80a3b69d---ruvoketararixukig.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/lutapetarexolop.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/pghe3vunfa0va2hg640e7df7f3/77625065865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cuales+son+los+sintomas+de+la+enfermedad+vertigoPDF 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_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 10896 bytes
SHA-256: 336ced833c0162c7117e42bbdbb0c8103046486506239120cf29d17eacee8e27
font_01_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 19520 bytes
SHA-256: d861c1084cc82ff40a8461a56ada52a13819543d48a8b8c34d37bdd49485748d
font_02_sfnt_off00017018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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