Malicious PDF — malware analysis report

Static analysis result for SHA-256 75974e8e5ffcda90…

MALICIOUS

PDF

93.3 KB Created: 2021-07-19 01:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 61750cdbd6ea205a361064c475839de3 SHA-1: 1950c505c1fcad1349879f204e473243ec562355 SHA-256: 75974e8e5ffcda90f54cf2516fd9bd921d6c5f56c0d478ac1be713816131b987
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/596ad6a327a99afa5e6d6364d6df8076/35298833004.pdf In PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/famajemubejuxom.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/93279482050.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/id7ac7jbtjv7v5ej9l5ulc75fq/87435980201.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cb945fefd8528919a97b9837fad02321/72326657859.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2d342437---rajupet.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/3649560027.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/vogosibapefux.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/lafitubepilitutulukenose.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608990eab3031---47355721934.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad69b7dd9---60380115892.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabf0f858---dipediwisovenad.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff9a99713b576357f8f3fdafe9b70a75/82730045460.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1a2eda85b---muwozekarumelena.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/fizoxujetuwuguzulapepaji.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gabadegisapasewulite.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb7007039---83345223553.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/42044125564.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/37844291099.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iuuef4ndeft3i0p8h5t9849a6l/joramovapipuxaxalesa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9b09b511---62453085807.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/99247144177.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/62930845824.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/20289882012.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/34067873976.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/311750559504.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05f8497e3---luzubefelewobuxenukagap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=home+alone+on+streaming+servicesPDF 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_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10632 bytes
SHA-256: c786ebe8f6f702f5b854a567b49d883fd22cf1c5edbc0af526b9baa2cee854cb
font_01_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 17608 bytes
SHA-256: f613f31e03eb0cbb8e7c0f611ebafe5a0e8ede57e185fe452c64a2c52f362b5c
font_02_sfnt_off00014fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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