Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aa118aa8569be8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 21:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 307d2f996e46f713298f4b011670121f SHA-1: 4ea54e331754ff623ddbf9dbcc70e299b325aa2e SHA-256: 90aa118aa8569be80a9ff5314ad7b55a5a1795612aa345385b9868afc04bbe83
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9956

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=dvb+t2+terrestrial+manual PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/pumutemonupuvegugaxudilug.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/xumoj.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/44103491964.pdfIn PDF document text
    • https://anup.bo/images/files/98077188136.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76b4b886b1---pasorovexitofiridagi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e438ea1e36e---vapatakedutonenometemuga.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/63698167429.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/mebasi.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/rabaxapovuwejimu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xipunufivanexiv.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7862b6f8f---50504997262.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/dalimuxaxubexerugiziz.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/ruforo.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/budajadevi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3a3b94acdbb091a7923afd24e5ab1b80/gekizujiwidexorinisaxo.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/nafejerudezuvebes.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607302e086d58---deligovafagazafo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608595e57f708---pujixozozugawi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/20119112371.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dipebibag.pdfIn PDF document text
    • http://amdind.com/userfiles/file/lelivamematobitufusir.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/lapavozulosu.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/92579191320.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_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 10576 bytes
SHA-256: fc7db8ff4811848da2181210a77b8c5329d0631f4d4adb3492759de13b7cc17b
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 17460 bytes
SHA-256: 6ba8f37e8ac3192e1da47c1be2a85b58f7abeb318d0d05ec294a3b3e2f51ac14
font_02_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1