Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ba99650b9f1e78…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 17:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7194be1f42f682b4e4be4167197f0fe SHA-1: 63dd5f23dd8fd08bd527a8b9f1caf0da7a2c39d8 SHA-256: 09ba99650b9f1e78abd88fc2f79bd6aa414f9ce3ea81f66560c98a27601d5c0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs that point to various disposable hosting sites, a common tactic for distributing malware or conducting phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://matsusushionline.com/uploads/files/57873872569.pdf
    • http://metabolitplus.ru/files/file/numevolisinudigirujaxa.pdf
    • http://haiannweb.com/uploads/files/92115793885.pdf
    • http://hongdanhaudio.com/luutru/files/88078866304.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bilipes.pdf
    • http://xetaihyundai.net/upload/files/65075251008.pdf
    • http://ckudzcssffhhj.handysociality.com/upload/files/titizapakutuvulejuk.pdf
    • http://technology-mp.it/userfiles/files/92286183193.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9cde80736cb9edfae9f190872674261/46022862876.pdf
    • https://martensmgt.com/business_school/uploads/file/tafomad.pdf
    • http://rcsiprojectracker.com/userfiles/files/voxemezexaw.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bec7033d00d1909b8ece98e64d3ad791/20806218865.pdf
    • http://syekp.gr/sites/default/files/file/nosiwe.pdf
    • http://yilip.net/userData/board/file/15186712902.pdf
    • https://mandarinusa.com/userfiles/file/1631613929.pdf
    • http://laibros.com/ckeditor/userfiles/files/61880984814.pdf
    • http://zeci.nl/im/image/liritemawadezudokexiwu.pdf
    • https://isagrinio.gr/userfiles/rilokusowaxe.pdf
    • http://grotech.in/userfiles/file/45441219258.pdf
    • https://rhuyscampingcar.fr/images/files/wirujama.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/857243b8626e935f6287461ab61a16f9/lapudij.pdf
    • https://tidurmalam2.com/contents/files/26276884718.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/35604028898.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68554999289.pdf
    • https://investincarpathians.eu/app/webroot/media/files/dowaxarurolupamanofixuvi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ant+man+watch+online+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f6.bin
94bd2283450426f97405b53ba2f474b113597c715a8ba6ab22ad05778df5e615
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 10872 bytes
font_01_sfnt_off0000e218.bin
00c7182f5a78b3c7a47935065ea920002053209095cacb42a780ac02f5eae3a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 17588 bytes
font_02_sfnt_off00011022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16792 bytes