Malicious PDF — malware analysis report

Static analysis result for SHA-256 e011ff954205502d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 16:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dd2e4676708dc651b2c2a85c1a36a3a SHA-1: 9eff655deb392f064ba360e0aed0c890fb2b320c SHA-256: e011ff954205502df2bbfe0e3cbe2bd7876fd3db06151bf5d8d61000f49d22c9
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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=transistor+pnp+et+npn+pdf PDF link annotation
    • http://dnepropress.net/files/file/satoze.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbed1f02d4---pekisalijurezudaz.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///37079162135.pdfIn PDF document text
    • http://unseretochter.com/images/file/tezujepurufopojupusomod.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4fbd8c3d---bugavilajewonatovaku.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bigaparopupukoz.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/90bb30d6410a0e04027ab176062fee36/mefokasiruju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb71df828.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/57974082205.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2f751a9c---mapaxizumewa.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/23557339662.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bab360c800e---fadeworasagiloxitajenat.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fuzalapu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/46717342428.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/dijovedivevemidobi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/duwotik.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/telugoro.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/86344185620.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/61196539936.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/vazik.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/58750944328.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/89429568270.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10408 bytes
SHA-256: 278fb02a87b5784d2154251aa0b60570bb0e8f335e7fb24c21f0448b3c8e7438
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17904 bytes
SHA-256: 4aa032f00a9d6890435e6299ced2b30185e63696b31cb0651a25a60dfb6ec5f6
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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