Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e3bcdad58746b8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 20:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13afa0987ae6ad60d317f0b899351685 SHA-1: 57778aec88bc9ee422dcc07d70c1f5b686c07221 SHA-256: e7e3bcdad58746b81c6880a77c7d2f9cebfd45cfd84f6de7f4da0bd3c4f3e0af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to lure victims into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=systems+architecture+burd+7th+edition+pdf PDF link annotation
    • https://aviseco.ro/userfiles/file/54019360155.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c206a057bc---dutanajurefuz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609888567109c---24340223775.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/91f479091e2c501417da981289e38d04/gaminavo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a835d18e---kijuwofiwonemipat.pdfIn PDF document text
    • http://boxethai38.com/upload/file/45613738008.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c8cccc78---33923139921.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293823ab232---20652074702.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/duraz.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/161903267652.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nufiximusitezawijar.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/68415098867.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/81544243375.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b6112afd9---pitafu.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/14566316557.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/ziwinebapi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/17649027256.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/gotesebi.pdfIn PDF document text
    • http://mdtrend.hu/files/file/nubomexorokexag.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fd7b6a5b7b4f8a90d9a2ae7874b705aa/sipafemom.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3367d5e1dcf20223c813e3565f3479f7/lafolofovilibazimowe.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/pupivuwaguwarezup.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/51391127060.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/13010150192.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/lanokolumovuzemozu.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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 18748 bytes
SHA-256: f33631b7234e4a26ac3e19ef900a4283101ca6079ab75b676ab7aaa3958f7947
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 11316 bytes
SHA-256: 14b81ab5f881f6703b5a4fef08cb4911517283ba9b0b9b25a55bdf444fa77b44

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