Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbb8e66d93a136f…

MALICIOUS

PDF

87.8 KB Created: 2021-07-22 15:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3637f510ef059d47d6e8e1e6eaf1f08 SHA-1: 671c4d3da6b8808a61cb98fd66870c0e875181ab SHA-256: ebbb8e66d93a136f00df4aa240e3157b81cf629fde93d7f0b8e3ed623a5b24a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to multiple distinct domains. These findings suggest the document's primary purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ef96a614efaa3b3514aa27ad20632877/73823443555.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfed5537a2---88788482818.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f233955bd---80402718633.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/53027633594.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/xejaw.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6mmg3rlinmtk8frl31kut7jd5f/duleripatoxumaxukow.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/35695272468.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/buvisedesigimuzisupinag.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47899322034.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e66883005b9---97985264239.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3001fa68a33525d838cb25aa288d1429/zuzolugonoxegasuvibotip.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/72401423483.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/cce4c5dqonie2dtvpi6aal1lme/57347506889.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/288831d014280665ebd17550385356d9/42660098771.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/wiletup.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/48262748298.pdfIn PDF document text
    • http://poorclarescork.ie/images/68813905607.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/037a18163355fe6dfe01f9c83a50dbe3/62468714365.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/8326312238.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/io3moda0oshnvkmdfkqb3ellb3/tutapejepej.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a915193b1---bixitotagenofim.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf61be98a---82455631866.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/xumepoka.pdfIn PDF document text
    • http://jar-ted.pl/file/bakemetuwakotirukik.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210714075051.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/fevesotabimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+grass+grow+in+clayPDF 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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16972 bytes
SHA-256: 4f2dfa5727b78d0db92a56c9274be7279159d37a64a4c3e62338041163d5a511
font_01_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 10408 bytes
SHA-256: f2772a249e8c9bea262b87cf34d63db5970f45663118fb4acc84c27c4c3c5404
font_02_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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