Malicious PDF — malware analysis report

Static analysis result for SHA-256 216d5d2db46950b3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 11:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a50e39157c0cd4e7128df4f0533114f2 SHA-1: f7698df34420faf4e483b818013cbe7e709e127e SHA-256: 216d5d2db46950b382cf0d080874c0e8c567286bb8f4b1eca86add786c630d8c
196 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of 'cmd.com' in the document text indicates potential command execution, likely to download and execute further payloads from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=install+chromebook+on+laptop PDF link annotation
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/n0upbjl594jt3kdfphdlsu4ck6/xuxeriwefaligo.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/3015493142.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/59138127704.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/45708526646.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/46665170904.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/2525600603.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/runebedatowedebomegoran.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/pedimufijodujuk.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/sajemijawugisilenakudozo.pdfIn PDF document text
    • http://metall-press.ru/files/51014849575.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/98164807055.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/23081018063.pdfIn PDF document text
    • http://qdcmd.com/data/files/sevipuna.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/52406665327.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/didupikuwixemim.pdfIn macro / runtime command snippet
    • http://studiopetrilli.it/userfiles/files/73671686625.pdfIn macro / runtime command snippet
    • http://lamorenj.com/userfiles/files/37120357071.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c6a215d1---33761445339.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/80317272024.pdfIn PDF document text
    • http://planbmedia.hu/files/53755657037.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/boxovonaworaze.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/namefa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hcv0mj1vm4sbl2p45rtdm4ubmg/gofovaf.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/xukelanerijezobod.pdfIn PDF document text
    • https://novahealthclinic.ca/In macro / runtime command snippet
    • 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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 10728 bytes
SHA-256: 411dc56480d472c6ff00d3baa79a6d972ce99488df0c95bb828b65d822d69629
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 18816 bytes
SHA-256: 541e148a44818a9ec9d2b376ab7f836dd90f9f08ffab7be8ce1ae88a51a0886f
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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