Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d1da59c5da3404…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 00:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02599d133a7a549697f3da8ef8d6e20f SHA-1: 5cd8d32b530263b12c0cd2a29da699f98b303952 SHA-256: 25d1da59c5da340402276782079af07cf814f283c38d0ddeb110ff2636ebd616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the final destination, potentially leading to phishing or malware downloads. The presence of embedded JavaScript strongly suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=themes+in+philip+larkin+poetry PDF link annotation
    • http://simpangkanan.com/contents/files/31443137074.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c7ae90156702f1bfa4f8d42d910d6cce/jewisep.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/53733754903.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/dixapo.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/64439271617.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/35385126896.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/naxubesufi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbb61b1dba---rakegujotudibevijesariw.pdfIn PDF document text
    • http://www.moyekolodin.com/files/8686084415.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/30886085621.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/76843024893.pdfIn PDF document text
    • http://onelove.cz/file/13205179008.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdfIn PDF document text
    • http://snft.ro/media/file/dagatugororewuv.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/37462889759.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/63608813306.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/42767236190.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xekono.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/nagexavefakuzaremodil.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/tatujamezanoxuw.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/29818276897.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161424223183da---32772284085.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109010154304953.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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 10684 bytes
SHA-256: 1d73453a2e0cf65e262b70fea29f21f2780d60e19af6aaddd5090c04abffa86f
font_01_sfnt_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16360 bytes
SHA-256: 8756c359f1b0b1c327d4c9ee9cca97fae860619e83916bfdb80feaf67a2eaef7

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