Malicious PDF — malware analysis report

Static analysis result for SHA-256 43645a4dec205801…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 04:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2593412b7db96c36d36fa40f875ba4be SHA-1: 95106b336ab21922e524c2340beee9fdcdfecc0c SHA-256: 43645a4dec205801fc31b3fa8d2c48cd84f3b55776f6b594182df8dd943979f1
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=wrong+turn+movie+download+in+tamil+dubbed PDF link annotation
    • http://studio-castiglioni.com/userfiles/files/83887502655.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/64377399341.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/15805669947.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/5854504104.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/34124911025.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/12966691691.pdfIn PDF document text
    • http://zgic.ru/!upload/files/92369769710.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b8d9f62---ligizet.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/tukedogudarifekirirot.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/96161776664.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314b0829bbc---davuxetakeduwukowiwid.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/92918192224.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fagukekukula.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ad2128fe---27481377477.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/89141936503.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354baa1d064---mevefifivebim.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/67185999400.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210910195512_yhnpy4.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/19818209318.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/jewajabotodevejoxen.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/523876e638f8ee1df6ebdeba9e4b9015.pdfIn PDF document text
    • 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_off0000ae20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE20 18228 bytes
SHA-256: 894717aa7578ca6340381c8817507e9040a3480ad74c46138bd1fe8ec67776b2
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10808 bytes
SHA-256: f845bd4bad4da55e0eb1100dd88a64277c0769fccdb2e240df77e5762c2560c8
font_02_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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