Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04d381cdba68ef…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 22:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 478d149b68bc2b50f7fcb5bd250a63bc SHA-1: 5c411cf1e59ad0a328499e64bbce9ab501290bc7 SHA-256: 5f04d381cdba68ef39e86f0b19f74cd9ae9472f1b50fb13962566665f32c8a4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple URLs, many of which are identified as link farms pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://evrenmentese.com/upload/ckfinder/files/fuwoso.pdf In PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/xidijimilaworix.pdfIn PDF document text
    • http://full814.com/upload/files/wimipiwomagefeliwim.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/gomereg.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/toputisarali.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/47124719920.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a57ab8c0de144c87e11e5b9a140e3a5e/42126602652.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/golopalezofegiguxunek.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/teduzizudiwopit.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5699cf942f669fa1bdf6407994227588/mosafaso.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c873a5a8458c0883c9f68c223da21cfd/97320111019.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/vuxalizufulidenin.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/84868841180.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/73014460634.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/piwinatukiv.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/65822418360.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/dosogavetijibedaraz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b98053eaaf---86988561297.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/xaroxogizamu.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/worabatu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614382fb138d5---wofesuxesudijuwumakaneven.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/1223836994.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/40101601980.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f25ba036f---91349788574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=allscripts+android+appPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 17652 bytes
SHA-256: b2d927f3fc8b4a5384a7e0fd43ddfa4ad8df558d856b32f3ffce94b79b083301
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10356 bytes
SHA-256: 3cd9a62661643b26da7d5152de1688d61b0e948058a317076c74f9c8858ee3e5

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