Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32626ed66a66d2c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 22:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 788baff5d4914a0a912688bf0be830ff SHA-1: 0477a0d277f8fdcfeb88d2980e886496a2c5a1c6 SHA-256: f32626ed66a66d2c27aeb7ef02e92d03ac5ab4b3e7b707ed01a1f9501aa48ae3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdf In PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/mifabumugeni.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/56245686212.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kobunokimojerume.pdfIn PDF document text
    • https://kenadong.com/contents//files/xokodabetone.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e44bbfe10474dd8ab2e5b3fab469285c/44970572633.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/julun.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/12811420847.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6cc749711f146e87a37e39dd8e94d59f/morusunu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/17703997783.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/1281728169.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5aae80e4bf---kutixagalobebugoxabut.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3128974e92---68524373819.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bikl9fqc510dun5709b7c1fqo5/geludisutozibet.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/musodipawopeluduvebok.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/83356732525.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///gapikofepeditorumobivi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fapavukonogomogesi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609095234930f---sebotafa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d09e0d4b---68892451606.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0o1crbqhdvb7hcctfmsc6j6ntc/67476628365.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdb278be6---57044234509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=md5+to+plain+textPDF link annotation
    • 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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10348 bytes
SHA-256: 565d4bbf280e8bc584be0010f705d4f4c9c7ab5480e073b29dfca5a49b7e0bba
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 17992 bytes
SHA-256: 47215941ba21f558ce8b6548e57228a79c4d87b7ca21f943d62dd2905a44efcc
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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