Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ac28d9b648b304…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 12:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e537ae92c4eddcd6edbfa1aa03592d78 SHA-1: 2873220e5d1e70d44c20eb20cb44717e4de14de0 SHA-256: 08ac28d9b648b304ed0f94d39643773c5e31eee30d039024f20e7a9d386bc27f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=2016+vw+jetta+s+owners+manual+pdf PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ub4ibp6620g8849u2ohgbbv01n/sivelekeka.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ca00nt1kt7opl95m8rhmcadan5/mabozebufetutobulo.pdfIn PDF document text
    • http://melabo.com/upload/files/78693505188.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/86141002563.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/98297880997.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/vewejukidenexewojevufag.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e157bda9---41517797847.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zajazezomozibopegit.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/66ef6c894030b87c10936b20e5cdbfad/99754333353.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fezikebetarasaxakimi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010801458714.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/mitamogud.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/40114550019.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cc7091bdfb9f5c77575a99a919bc9335/pitujodofofe.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f199cb80efb---labofapiwi.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/30282022620.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/59435838569.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/bijevonujixuwewalazeboba.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/93368708880.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77345259310.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/538f0bcb7393dddbfbea63f1ca2abeff/soviluzado.pdfIn PDF document text
    • https://capecoralliving.com/media/file/33734589264.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/1630268472.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaff1b3201---50047092180.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/36702031535.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/xijowipep.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 11316 bytes
SHA-256: f386b957b0d1b8b4af52be3dd7adb97f8141e4841eceea10d5932fe1e808421d
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 17700 bytes
SHA-256: 6fe104dd6f33cb7bad82cebb5c768b8fa9f0c8e609b45893578faa7634723360
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1