Malicious PDF — malware analysis report

Static analysis result for SHA-256 828fce56e996c497…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 05:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 485dba8cf07d397f92cbe66e1475df0e SHA-1: 048fa6b5e8e1464fedb7597ad15ba9f0bc3e7b49 SHA-256: 828fce56e996c49784c2f14c0fd11d822fe17bcfdb5ff115bbc0ef3e821f18a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also includes numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=creating+a+successful+business+plan+pdf PDF link annotation
    • https://escaletravel.com/userfiles/files/47226110424.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/mumib.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/titoseledeludukezi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/bamotabigozogar.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03e389420---xaromupojavipo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516200344720863.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/151bcf98123857f13e19f294c9167852/2729977973.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/160b520f4e746eb7b347283ee5188b58/xatitetitufimonikujir.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/dca762dc37dfaf31004df4f37f2473bd/zomusebowewidorisi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/778630d2ca1c0bb11a4c7728fd308832/64486870809.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/47f44f6fe44b05d68e98150b33a04936/natulinunogekokuraji.pdfIn PDF document text
    • http://rc-modeller.se/images/file///18079193822.pdfIn PDF document text
    • https://nada70.org/userfiles/file/21935553279.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/fitobelakovufawixipit.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610865a1db541---74055594976.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/20493097013.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/57823511440.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad3e5840b---zojiwepa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe6ba5bdde---24763292433.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/69549879040.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/88398513376.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607638775e5b8---jegobifobidabi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/b8l43pigcmrqsq14868b0up99n/lovisigun.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_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 10948 bytes
SHA-256: a222b4970a28b74b4c4cee2bce1bf17c5872e215b99f338b23e62b130dcba900
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16456 bytes
SHA-256: 6a93c1217a6b80bb3a72c2e185cace46d551e67f584315c85f8265cee89b852b
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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