Malicious PDF — malware analysis report

Static analysis result for SHA-256 536753ff15b5d37c…

MALICIOUS

PDF

100.7 KB Created: 2021-08-18 04:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 80f953c3c6d6e9d5f590312be3c1a62c SHA-1: b8bd4ce8fa76cfbc77aa64bf6410b4e527fa34d5 SHA-256: 536753ff15b5d37cffc1130d2eeccc672791138840f5b0ec3ff77403fa2d2af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 0.9908

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://afayl.com/userfiles/file/40866752786.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/71428464204.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lewuguvaxivugovuraminuv.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/rajirawagepowijama.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7d9ea6ba87ed1f999655adc2bf1dbfe2/dawesilogasedegos.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/xadoxabidakalapejiwofumo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae31f6bf648---jowolopupugirof.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7e962477---5872880031.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a95203a44---duxalexedubidifetolavux.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/54687272062.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/20187124010.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210729223225_zbtrud.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/gudovi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4937139aa---basunemu.pdfIn PDF document text
    • http://castel.lu/userfiles/files/27415374428.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/3528324153.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/zejazogibipawu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e666809cf77b5c00f05c2369e4545aeb/76947956890.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/10847460832.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/v6ekkovtl6ia4f1mcik9rkqg27/xawaripunalatasixod.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/27513357455.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/voregatu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b67c1350d---27756545574.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vetoxuvevozizipaluleki.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_164410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reactivo+de+molisch+ficha+de+seguridadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 16460 bytes
SHA-256: 128991f5c1439f1e60f0d9765295b5ad66d1b063a9a2765b31b3552cb36eea64
font_01_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 11028 bytes
SHA-256: 8e6d0c5799603ebd21851d4ecb6a02a7aaba80d1f5709a0369af8d782f8ebfba
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 18104 bytes
SHA-256: a76d2d43cd3f55d8424dd5e7b078dbad65a5a3cc238a2d9a86e26234e612107d
font_03_sfnt_off00016aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1