Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bd049762cface2…

MALICIOUS

PDF

95.2 KB Created: 2021-09-06 21:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2aef9db66461d575984b7c9f43ff64a SHA-1: 284977868715894ca065332172e66fe91f0e09ba SHA-256: c9bd049762cface286bf39b7b4868591c852ed2b7ce3f944999b3686b2941439
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious payloads or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=rationalizing+radical+denominators+worksheet PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b255f37f5c---9204859350.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/kokolakumufedepegitaputoj.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/97656368228.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/97898835873.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/67038260062.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/93158588460.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/54026830961.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16127216c400c8---romekol.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fca1e74323339dec613c34cf63867792/lonibirubixesa.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/53569349833.pdfIn PDF document text
    • https://luminex.pl/upload/file/xelarebavarudemoputit.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/mazimojaladonivukikef.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fecb2b108c---migadez.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc35fa8028---54455008418.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/gavopajitujij.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/21028193022.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b1eeb187a6c371e3a85f5ab7086eaa29/2744677035.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/afce301c7deb3a60709fe0a250ca85d7/sunarawunasidedaju.pdfIn PDF document text
    • http://gotween.com/userfiles/file///bojogemedomuvugo.pdfIn PDF document text
    • https://huanghecables.com/d/files/tegamuvotijegegasebiwakas.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/23190482303.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c71ecd95351---boxipegigupeda.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/rigibuvikitideme.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/21323353848.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_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 17604 bytes
SHA-256: 41bedd973fa5672603bd289f81aeda8c3e12cb997c7bf447e1f4cd3790b6a15c
font_01_sfnt_off00013ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 11100 bytes
SHA-256: b014ac4076a5a0a7a650273d82aec17993caf3506c771cd37fbf340f7803cb45
font_02_sfnt_off00015682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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