Malicious PDF — malware analysis report

Static analysis result for SHA-256 b651c56b90e456ae…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 01:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2731d11dab0e1410245f349334932a5 SHA-1: 5e7e551bc5ac882ae27162ffbf00450653fd1c38 SHA-256: b651c56b90e456aefb7e9eacc8b298bb9dae40c9cc028dad37a57afe55f67dc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=wwe2k17+apk+obb PDF link annotation
    • https://tyeetomsfishing.com/userfiles/file/73795276369.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/85147939940.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vavuvulisedabe.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b23b239414a58068540c001936b05088/44431065997.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/50982016026.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/69397147052.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4daddab7d9bba056f2dfc5e078a88511/mixajosim.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wopomemubawanuxup.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/votakibobu.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632057655.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/lurajorinuwadeviperol.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/db76f0ba058c3d01d310f0d29dc6c729/ginavexozuse.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/42483664535.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/02ssh8tbmc49s47emeo7arnj03/lajesufa.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210907_020516_193.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/xepixenubiwuzabafemajater.pdfIn PDF document text
    • http://fxlcd.com/upload/file/kujobije.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/32773762875.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/48771522672.pdfIn PDF document text
    • https://e-midas.ro/files/file/83895213808.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/lixexuxep.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/zinuwepulidemaj.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/75145314973.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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 17388 bytes
SHA-256: 24b8c264f59898f87b3261fdb1b301d87afcf005fce2e7b9f926fb54b8cf186f
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 10168 bytes
SHA-256: 4a628dd962f6e8741d7ab11eb83d7f4982fad0ca37e4e3ab8dccffc6e13548de
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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