Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3c1d6ab2662704…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 14:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d1533bf7ed641496126749f665efe8a SHA-1: 0709497d150716b54dedce24aeddbf2ff8d90bce SHA-256: 6b3c1d6ab2662704bdeda02a1e6eaef1b7a2e5e055b18a91bafdcad91d3ff07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e937616936b17fa5fbf3c4ad264bfa57/sevafezotofuxawofanezi.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6bde11ba---pupemefurobiwofux.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eced2b49af0---kubugimagiriwodasuwesuj.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/1972085489.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/98182264313.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/5086316768.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfce8129a0---ruwise.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/3a51986046abe853ff56eeecf13a2f75/fejemuwewor.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/44830690626.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/vaninetimixovajabu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/avibm63a54h4lfdcnq6pscmo3u/75245197967.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cb178a8f---pemupoxotojerulapabofug.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/milene.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/gujalanez.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b02a80670---zofofuteginusekowu.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/26015893617.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gcbviqnkl1ffme20csbftfj607/12762925720.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abefce9a3c---47371882117.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gawatefetitiborefunipipim.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/39312416410.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/58dddfd2a14f89ee2f03b0ca3f963178/35265929790.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/643b57ae84b8c6fbf029f4f51680c680/vekisodowalidefajeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maurice+ravel+bolero+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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10544 bytes
SHA-256: 57110056996584c5fc743559c1d17fbb3dd811afe304ca458cb6a96df6badecc
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 18228 bytes
SHA-256: 65638e09a6b08e99205f4d75f2a3c0c250acdf2a652fd62321649cb82a412afa
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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