Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa7be7e2873d977…

MALICIOUS

PDF

81.4 KB Created: 2021-08-19 03:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbd4d90e3f7c7a093e2720291d89c1db SHA-1: bec298cfdf7b59955ce71e6afe96a056cfea06ea SHA-256: efa7be7e2873d97766c08b704c07e3fd8515c67b42246afffc08dbfd32dda8a1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of these links suggests an attempt to lure users to external, potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • 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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/fapdmfodnqasrp0ugal8ju49ng/17817402437.pdf In PDF document text
    • http://logo4you.dk/userfiles/file/87050360630.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/14065746204.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/dimoxavijigupamuxovup.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/662fbd6e921216caa79cb94d435ca7a3/kuzowaxaxed.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051805234173499.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/15354543228.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/lefejuxa.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/44bceebaf8588b451e8e9b610297cdfe/suvitadunenotetev.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986900eb8f8---suparesevazoxipivopodufeg.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qui9uovmlq53bu5849qb7c5ni2/77381710772.pdfIn PDF document text
    • http://sdes.in/uploads/90320047984.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3738c0821---93643146280.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/77008459070.pdfIn PDF document text
    • http://cl-pub.com/files/files/69378885762.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814a960ef4---44200389916.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85ddba4b5---48848851956.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pawizekijixavakupuluni.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/wibiv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160855636c84dd---7353165914.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160726e23bea3d---mezaga.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021081301323580554.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/74550882392.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e91d001f3---gebekirezikop.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/64672042560.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/wiwaligema.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/56657792321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nova+black+hole+apocalypse+worksheetPDF 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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10752 bytes
SHA-256: 32091c6139f6918a8295d4d9abec672daabe70cc5ffd6104d27bee2cf7ead684
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 18108 bytes
SHA-256: 1d7a2a21c0455d247c9d8eed73bd5aa060523129c92e734ca04c66f234a9b677

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