Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd8a59579d7a77…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 10:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d723582d64585bd936d80745dd32d03 SHA-1: a3a19b43feb68a1ded4da1a96999a819f98d1e69 SHA-256: 3ebd8a59579d7a77441d677869d2822f4923c63171a404264198aa47b411b1e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Fake invoice / payment lure' heuristic, combined with numerous external URLs pointing to compromised websites, indicates a phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8df3496c4e---lavovesimizasotazesija.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ehtk5j9boqjmpbniv3m3lldnah/xaboravowazefunexokuwo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077f67bd0ef7---77754226233.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2bdlpgl7uvqikiq7tb2gg6lms6/1203352254.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/63522370220.pdfIn PDF document text
    • http://palami.by/images/file/japezakijuforizomisurom.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/2748334327.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa85860613---14727611322.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/41422678847.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdb6578501---nolerigu.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/96983643112.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/sadenekafukodakese.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/39228174389.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/15024869274.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/77022232331.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b90d6b47---85949847214.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/bodirixenuxakofavip.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xikuna.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e576e12ac4a662f8e2bc15c6c082511e/77576934354.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/72073391891.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703299a1397---53367394621.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/75173103135.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24972b4c7a---56464112688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vehicle+bill+of+lading+pdfPDF 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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 17148 bytes
SHA-256: a9bf3674eac2bbff9b3e4aceae255a3a5ca7bf15d0806dee3fda5062243fe383
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 10644 bytes
SHA-256: e48e22eaaad3f3fec7c4db860b7896f931bf570af842fa96bd6fed432d240811

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