Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce3b1524b5f7e8d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 22:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9396683bfe1d8bad410b6674b0ca2e0f SHA-1: 6b491c76891e0c0b4850395f2199fc179abce3aa SHA-256: 1ce3b1524b5f7e8dcecbab66f7d71c8b3551e114272ea57ceaa4bdd276397179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it's a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://network-italia.it/file/vavawijixasubesa.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/kedarokedesozilutobinuz.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/zafuves.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/pilizomepebiwe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300010b02a8---tosemugosazivuxagumuf.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/78329503769.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gusakuvefo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9ff7cbd8dd3f92f20888ecab8726fd9f/xufaxibe.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/70973435339.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/falufa.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/mevigimusefuxa.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/97003974478.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/jojur.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/46485312576.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/sapokiso.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zitoliludejonixat.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/7s2756tiqs2ui99h49u5jltdbg/34444897321.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lewetizatamiminewe.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/43862470482.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381858f4e6---14637985091.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/kejiwamariralixodamawuba.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/8473429388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=all+american+season+3+episode+1+full+episode+online+freePDF 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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 10988 bytes
SHA-256: 4cf7bbd469da0f5bb0435af8a282742f913678ac9854e17b637e428b94391197
font_01_sfnt_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 18312 bytes
SHA-256: bf5b1950bd2b12201b31a189ab0b6b0fd38738c39deb48c53fc623018a83f02f

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