Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d41f3623a7289db…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 20:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9cc09ecd6e4ceba515a323b0fc8a739 SHA-1: d054251d7b0e426654566dd01d89a1ead20701e5 SHA-256: 5d41f3623a7289db01e5c7a36d7e0b9f488f5e259b9b0aaca572c57fc7a23fb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of links pointing to various domains, many of which appear to be disposable or compromised. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure designed to leverage disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are probably used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca8173ef3---wuvuzegi.pdf In PDF document text
    • http://carrozzeriardue.it/userfiles/files/madawudavinutemim.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/4936177297.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fuwepugewewimikezuxalu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/mazivex.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/25967437777.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-10/20210910014712700653.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/kamaluxi.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/gedigamuzunis.pdfIn PDF document text
    • http://spiregene.com/image/files/20210919_160704.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/59246980389.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac6587cb---96521754374.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/10916715137.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315ca074490---82826388179.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/fumuzipewamoduxotatofisu.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xifonavi.pdfIn PDF document text
    • http://bamor.org/userfiles/file/69185820568.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16131179e1ea30---lowovepotet.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wogugukuvutupoxu.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/puxebudobenima.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/gepokagikikewuxesoni.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/puxanafufe.pdfIn PDF document text
    • http://yoron.net/up/files/ralamanibomu.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/pinozodotewokusebijedafa.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/lifokaneketedubafunuwetal.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/99302574899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=release+date+snyder+cutPDF 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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 17132 bytes
SHA-256: af7cd965a7411cc5b27e53d5127d11dfcdd1057c31a213e0262d04db54fea924
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10412 bytes
SHA-256: fce55ac12364f271e0dacad216aec6ebbbc6ffa14783293d02d72d80cf8a63e0
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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