Malicious PDF — malware analysis report

Static analysis result for SHA-256 46331c2556e4db48…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 17:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ed2520514091db27ba2a159b5e4ee8e SHA-1: 854096b36d9d85276e8636eb478ca58c74c352c4 SHA-256: 46331c2556e4db48095d2a16429331c2b2dabc6158204a729cb2021a831df126
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites and other disposable hosting. These elements suggest the document is part of a link farm designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://vishwkarmaenterprises.com/webroot/img/userfiles/files/15483121962.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143789b85e70---rafikajetegikizuwasi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20fe4b928b32e864f47761de6cb8b64f/finegamatufapaterowuga.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/butadivuwapiroro.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/99714848767.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/lakize.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/dixufeketalamemififuror.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/rofakefunebukowuxozaz.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/pibesumagexofug.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0910f6b8---90962594361.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/guparigobaxogakenefuja.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/neseselajin.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/99582758442.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/savopawivofinokixanige.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/xunebesonogapis.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/90106171802.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/dazakalowipomulirid.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tlgg16ar8df9p21m3ll1aej9fh/15085972757.pdfIn PDF document text
    • http://aquatherm-graz.at/files/romoguxurokidogalekedaw.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nixilogipewuwemimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+online+bohemian+rhapsodyPDF 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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 11024 bytes
SHA-256: 48d26fc8b897a336eb1145c5ce6159b0527713e60774aeee527f9fc8b1676022
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 19052 bytes
SHA-256: 5f4ccd0a8eecba4cba987a828d897bc49396c4d301a32da9e447cea4b3ad9329

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