Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f3a0fa6df95b35…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd6943f9628b27775f060e4d33dc3c84 SHA-1: d5c93e8e1f153feebfd7184e51262cbab9f93c88 SHA-256: b9f3a0fa6df95b3554995c12f37860930ee1b55dad24e58eb2d6fbad859a4b89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://olynskiconstruction.com/pics/file/29341328835.pdf In PDF document text
    • http://innotack.com/userfiles/files/45230772056.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/51352191918.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/39331332181.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/resobiva.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/62206724590.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc96571df2---20384827446.pdfIn PDF document text
    • http://aimic.com/userfiles/file/pamitib.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaba68a76---91281631730.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd632c53f66964322aec6b6f985027b2/ragemaborumemoxipavafe.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d0a1eb34---11499051635.pdfIn PDF document text
    • http://kaies.cn/upfiles/210725105914601617wfdk8z.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/xosiwoxadonum.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/lukixenaliwetiwamigo.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/dufara.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lm5vgun95jl6d6c3t16vfol3i/zemaxux.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2369cd02---lesisavisuji.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/puwujipolikavanor.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077640377576---buvukojogimeponifominiri.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1be382612---josalowif.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/fixejukenowedewadivevuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=marketing+manager+resume+pdfPDF 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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10860 bytes
SHA-256: 38168dc9ced1365c01044ca604aca48e90321825ebd76a5517e3eab49a7d1527
font_02_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 18096 bytes
SHA-256: 590eb68f91a7c3d732df3dcc150e8143603a0b1c2f28f970b216fca5a8d29b50

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