Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25ac0d12ec707f6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 14:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 585b1c115d6c56d3cb4ab6a2ef06be8a SHA-1: b2f4d4b33dcc3dc63dab326956ad53903d1390c7 SHA-256: b25ac0d12ec707f6e1fd3e4f9d79d9b47e686d533cc80f1b35405cf4d59a4065
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. Heuristics indicate these links are used to direct users to potentially malicious content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ecosolar-energy.com/piceditor/file/kupugepunomegegidojoxap.pdf In PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/de819837b1980a1b8f56f12da5858a43/50103801523.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7123a0aaa1139c4f7f141dc39a295cf7/pituwaxezowuzutip.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/56535732483.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b08911260---57703719815.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/76847654133.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/31888594854.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/24103597823.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cfc093ace9b4f1cd13ff2ea49187b592/waxuzezijatagijaminatev.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/58879098793.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/pilarepetoxavagusow.pdfIn PDF document text
    • http://amandamaitland.com/images/file/53195659721.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/25828643563.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe6e72e24---sowamakug.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c3b736a3f---dixujaxugiweget.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/jopinesedidonuzun.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89a730846---zumopefamowupan.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/rotizakajakegagixekalama.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/42b88707ff7df2c868680a0c7fa75912/vudomuvuxixadekoropigeto.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ngja57oc6phq211c87nr04kjj7/musovomojorax.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/62330697435.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c4da0bda656cea788b693a064144e2bc/84180904395.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070859e8dde1---84641165827.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af03b43e6---zarewep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=learning+licence+test+pdf+marathiPDF 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_off0000bd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 10904 bytes
SHA-256: 6d32b9d0358f72934a8716518bff2178501183821136408de5e39e7f32612f6e
font_01_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 17020 bytes
SHA-256: 6bdcb46be1ffc46bf258f1a26963446d5181c34df79aea57894f69b903a23e01
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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