Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cfb4f8283248d6…

MALICIOUS

PDF

77.7 KB Created: 2021-07-30 08:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6f6ee82672f8c70d01b10ea335bc42f SHA-1: e4dbf6833142db550f7ad7486b1f539c1a5007bf SHA-256: 58cfb4f8283248d692afbfdace3d5f80c3add6c1d411c4f32f41e440e90a7d72
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URI heuristics further supports this, indicating the document's primary function is to facilitate access to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/37511163416.pdf In PDF document text
    • http://brezov-gaj.si/uporabnik/file/siwusavimepewimukoleb.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/fujupolepaje.pdfIn PDF document text
    • http://anupbolivia.com/images/files/35585587512.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/47559096848.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043006155329.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3f7o6fgnqu7bsslhj1876h976v/fimebe.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/34365660287.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/95618598747.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/18308829503.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/fobunoresetiroxog.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a699bbd5320---nipanimefewexepo.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/gawojuwiguzis.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/zopewimugumoginod.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/jedubovuzazakop.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16898967792.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/pi0l0gnlq41tudbusqmr31884b/gujuxagam.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dijeg.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b67aa8c4---xokufapakolatujuge.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/likuzububisiwatenepirif.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/abac9144ae7cf0e30436dd22c2098a8f/8156490522.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764a51b2210---kixomukilib.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/22392883304.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bfaf1e3f0---kegudanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=balancing+chemical+equations+practice+sheetPDF 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_off0000ccc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC4 16352 bytes
SHA-256: f6d3dba04ee8039c44dba31cf11d8c30c5ec8d5c7ce1b5b5ef434b06b68fbc1e
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 11120 bytes
SHA-256: dd34aa00000c09ae6e91bd195e2cab478b65df5267648492e8cfec407a4b614f
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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