Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b71e6c7b3cac0c5…

MALICIOUS

PDF

79.8 KB Created: 2021-08-09 20:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d5540a8bde48597ca54d40a93d9cfa4d SHA-1: f5c7ab072f2895b2e4cbb5aab2b1ea920a7fd4dd SHA-256: 6b71e6c7b3cac0c5f3fd8de5a958a45441d16886d6f23ca21b796af1807b222f
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 0.8085

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eead1c1e4---sebexofav.pdf In PDF document text
    • http://teplospectr.ru/images/files/moxudubewapi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/natudakimenom.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sipl7nau8d5bvca52eofvc8tec/vofuzenoxufemebofajerezu.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/60894983959.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f33fc62801e93c768849d488ef1a04fa/janiginidusu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091008195918---1465937614.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c0c606f59f4946b695526648b055e116/68159720024.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ae7d7190---libapigomu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8pb6q49h9of42ltu25vll85972/girozazavasuju.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722bb710f5d---belanowi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1dbe28b1357baf8d8b915b52388211c2/55109756083.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/todexapulovusuzotinigu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083249888311---83202782757.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/josonukimiratuzis.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/366177158.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/36249853319.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9d1i330taq4mimdlpc1r1vedcc/67309348185.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/79837962369.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/97325812118.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91573335747.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/4295045347.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5ca8d7cb---80421127542.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/sazokonumur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dna+the+blueprint+of+life+coloring+worksheet+answersPDF link annotation
    • 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_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 17364 bytes
SHA-256: 7d6a6e5b66294a7e896ca9a0f63f97bfe6c6b614627a0e8e26a4262e6ed7862f
font_01_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 11176 bytes
SHA-256: 5e9aa9a6435a8f9bc7b6300ca5f910b5d357e5b444a9ba24f018ecedd9e6dab8
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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