Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9408347f3174aef…

MALICIOUS

PDF

85.9 KB Created: 2021-07-21 02:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0256554d330e67728a9bbf03b60dc304 SHA-1: c6fb4c94b746f694631564769c540aeaf2df29e4 SHA-256: d9408347f3174aef155e351687775b4bdaa01a1cc8713ad9c07b8b5833034c1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggests the PDF is designed to redirect users to malicious content. The embedded JavaScript likely facilitates this redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/09ff6d8b8cbc7c871a920dc6ceeeb5c9/48699871141.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e390cb26763---70241843356.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kenaborobumow.pdfIn PDF document text
    • http://mamam.by/upload/File/file/29917444897.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fa79984d---losozape.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/fidaxuweguli.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a766c2de8a7---megulifumenozulik.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/5076851857.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7eb4271---vupakopirevuxepujotapew.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2016a233---wowepekekolisulokivenepib.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/18793512784.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xelemozezo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4ce3b3325dee72b5ddcba702d9fb843/liwalitakumopapebivi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1c50e3e8596e31df64edd307ebaeb708/kakuzetedukib.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lupatirokupuposukogo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902f7225acf---winuze.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/28542601234.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/98570008706.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/62086115927.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/badivu.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tojiwusidis.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/33a87b1329ed3450f86b554c78f21faa/xovuvirire.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2038a6e2357b8b9f9752d63878cc125f/66714099498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=capsule+endoscopy+is+used+forPDF 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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10760 bytes
SHA-256: 87031ac5493873a47c6f67e549871925ab312fed95807cc632fa35ed84b68bc8
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16400 bytes
SHA-256: 19c45a82bc617054acde317342f575403df0360d4550e6a480a34396213fa8fa
font_02_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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