Malicious PDF — malware analysis report

Static analysis result for SHA-256 42586e6009103da6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 09:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d00689845d1bc7326083d7ff8c63abe4 SHA-1: e6b149a2164c362258138c18ad4de820589da368 SHA-256: 42586e6009103da633a4976f44d72067c40962e91c67dbb46c3f73d71c5d0e8c
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of external links suggests an attempt to redirect the user to a malicious site for further exploitation. No scripts were extracted, but the overall structure and URL distribution are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=scary+games+to+play+unblocked PDF link annotation
    • http://mislenyiallatorvos.hu/userfiles/file/sipupejatuvororidom.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sinox.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/zilazipafuroroserate.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e358537840---67380865128.pdfIn PDF document text
    • http://skupka23.ru/upload/m/sevusoviviwudigamif.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e24381de5ffa439792126ccc9b459e07/56590997821.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75adcd429---87733375541.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd31d0bbf9---69030381498.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/gezatuzirokisivozi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/96302044899.pdfIn PDF document text
    • http://bndweb.nl/upload/files/jevot.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/xesakoropijeleso.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/92955260941.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/93d6fa3d764a2d1f700c5b10eefdf93e/75616043784.pdfIn PDF document text
    • http://briztravel.com/upload/files/kegaf.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/53991958167.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/4255192080.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/kuruvugemexovozenixu.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/64250607443.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/ruroxonodufaparokajej.pdfIn PDF document text
    • https://bem-sa.com/img/file/sisizewonodazesafid.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/lokuvonajeduvumuzu.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210909110032_gcc7wx.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_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 16676 bytes
SHA-256: c4655e4960dc9bda9a142109e082b0f42b584b493e5c83f6b70ea3be655e60cd
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 11288 bytes
SHA-256: 9266998aa1e461c6d634a6c8c92ace9c984af0d9f1700af074909f2deab17e3d
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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