Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e07f91e7e5bf1e2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-28 03:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cbd3ecd379dc19af199b529acf3124d SHA-1: e3d8cf9625f26694c9cde78410ab82a1645e47a5 SHA-256: 7e07f91e7e5bf1e2624a2b1af52a5177657e91c3834e7f006d5e348f30a13f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dd98e213---85387245039.pdf In PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a568d7ed04---66464501708.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/zokorivotu.pdfIn PDF document text
    • https://edarky.net/data/file/45241325852.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/99261121014.pdfIn PDF document text
    • http://wjcopy.com/upload/files/lamovu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vekotuxulukebup.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/33420990778.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5ce24fe6---widibumigebifumuzojosov.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba128eed6---40950823726.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beafb4a6d59---99802420134.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/79168686041.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b46515d1fab---xoluf.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xikoloxuzesamerazono.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18b0cdb6b---ribodavabelomodiwoxibajaw.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/87644292917.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077941e39178---zotolomoliralevujidadu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0dd30604b7---ritepeduxijajas.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/jefeburazizomonipuf.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/82597794617.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/i47np4khn4g6jvl8ditndtcas6/13499869046.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/nosetuxebodinomibojeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=productos+de+la+primera+sesi%C3%B3n+del+consejo+t%C3%A9cnico+escolar+2020PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3027e96a9f9074905767c836893054cb/xofegamakivumowodab.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 11440 bytes
SHA-256: 40f271cdd7f88ab5ce7e168a80e60cb0985d93730110a29ecf4b6dc4a35bcd07
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 18648 bytes
SHA-256: 011202d0436da72feca7b9dbb5a73e7a83e893b4e9bb8ebe1b35e9d309b4d78b

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