Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de09121058863a8…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 09:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df78ff2f16ede55f59dbc1349ff49126 SHA-1: 6ecbd2e00e562563b61fa7c35ff4b440b28402ab SHA-256: 5de09121058863a8e4afa988b3d6c5e45cb54a5f9ee7b80fb14e2d1046492567
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. These links likely serve as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=gramineas+e+leguminosas+pdf PDF link annotation
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656c9228b---43005024832.pdfIn PDF document text
    • http://domainecomps.com/documents/files/kewoloz.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/fokavunamajax.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/3a6a0f4cd0de76218c13cfe0a9e37451/setuvuvow.pdfIn PDF document text
    • https://andana.us/files/files/jabun.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/ritadularodub.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b336218729---pudojopef.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ded84279cc1cacbfe7d055dd85b9062e/26938613317.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/44551695185.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nepedagugirevuloren.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81baf853e8de1584b2f80086d46f97bd/26050636061.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e7d548f4b72b8a7e7a1b02041016bbe7/vewulimisogilupazagoxeniv.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/64091127481.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/30564905949.pdfIn PDF document text
    • https://kenadong.com/contents/files/rarom.pdfIn PDF document text
    • http://tabletopad.com/images/file/84117099176.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/51014740265.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612933c6631b6---lotewogafizijato.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/tajotomovejupapebol.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dbdc5e367---42702743868.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/64450242466.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/11440178346.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j2u27bbksoj21gqid54irnl24k/62675569321.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/82108723984.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_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 22064 bytes
SHA-256: 316b84cb6834fc55dbd47d29f84740ce7dbb8dce3ceaee2cffb6fc234d88a676
font_01_sfnt_off000149b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C9 10880 bytes
SHA-256: aaae4269dc69aa80a1cba9a41fbe715ec08ac7086fda75122e8528ab2d4a64a2

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