Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a45136972c6367f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 02:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a34ef61bdf4150c5ef6377f87981a9a SHA-1: b3f6ef330c3fa891424d22b23765c7d5ed8de49d SHA-256: 2a45136972c6367fae61eca1cfc0b3fedc066eb498574be22296371a8af3f4df
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites or disposable hosting. The presence of a visual download button lure further supports the phishing or malware distribution objective. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fapannimario.it/userfiles/files/laxubafetixujapuj.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/naxivafi.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rafazeveguwisokifo.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/93424450073.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tunejirivamigasatugugu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc7773c39---73675606314.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/65562119252.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xegofimugulumerejojupidan.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/gomexanitatikoxa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135414f11815---junutedevebididav.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/guvubeliwuzajosisudagop.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sn5g318ilanv7d8vr1i81vp22p/xupumava.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/22214358125.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada4bc1a00---20532374628.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/rujesedizijosit.pdfIn PDF document text
    • http://warehousetraining.ie/images/saredarumebasedexuwe.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/36431520568.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/zavutolok.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/sarowiritamuz.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/47736947032.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kokutumabiruvufuv.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161313cef9cd6a---2253819888.pdfIn PDF document text
    • https://langumeistras.lt/i/File/49639063822.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/gegexozedemidutu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf19d3848---neludugetovadurebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=device+manager+android+unlockPDF 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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 17660 bytes
SHA-256: c96fbeaf419dfefae361066a4d90da0e3b8fb6d05d31a1f1f4cad6876653ff89
font_02_sfnt_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 10704 bytes
SHA-256: 1a1a886c22cab47e742d57e01c624d11f847096ba2efecccf0877371ac8c87e3

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