Malicious PDF — malware analysis report

Static analysis result for SHA-256 f408f3130c803dab…

MALICIOUS

PDF

75.3 KB Created: 2021-07-31 02:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: c51fa1bd5c8601ed50d594e47b5fafca SHA-1: 62b72dad9c18c807ecae7e3ac82a546a00c6711d SHA-256: f408f3130c803dab48477f896e292a969aa73e4c3bb1d3d6a46534e1047beb5e
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://room12shio4.com/contents//files/wunovorozudekemaloxilat.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa29f6cc255---bokete.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/99712813722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1daed3c4---kisamuwelipelalub.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef9dd42dd---39941658335.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5c980642---vawozu.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/54244584523.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/o3l8q578dgb7d5ujrerc85vmb4/29976473434.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/55396098635.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/55587436046.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/juvorepuxisijeke.pdfIn PDF document text
    • https://highrise.pl/file/juritasepitefajux.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f7005094c2ccaeb181a15e83a19b177f/lugipujotoje.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7db8a43f---xunepivabuwofupu.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/12031917298.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922ff489832---14117510136.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lesovaxejefirof.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66984452866.pdfIn PDF document text
    • http://cuiquji.net/d/files/93450819028.pdfIn PDF document text
    • http://guchenes.com/d/files/77089765179.pdfIn PDF document text
    • http://tano-cable.com/d/files/62027727072.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee866dc9b7---zoxijapurotati.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ascmomghv2a9bh6dmrfd1ivh97/12491118731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sunky+the+game+3+downloadPDF 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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 16216 bytes
SHA-256: e9d4f74fcd23e93e4a7be8fd37ef9efbd1daba36dac6058cd24d2482ab50f15a
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10976 bytes
SHA-256: 301cda476a23f34209379d3359c1e9163d57c65626a34110e3fb3837103842a1

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