Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe620c144734d7a…

MALICIOUS

PDF

72.6 KB Created: 2021-08-27 23:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be5825989837a386d7c7a57bdf29bc3f SHA-1: f1e162a5a8b64d940a3bcf3780bc7617e08aea65 SHA-256: efe620c144734d7abc101dd5fa778b6013b62f460095b1b9b0802cbfc5720078
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=nicknames+beginning+with+s PDF link annotation
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/167df500f1eef2875d2db3ff295e3f3e/94798464906.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/dexamunem.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dlr63grjrcao4ccg9ebncn1iis/71282957524.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/69084801300.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/11216827685.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/sogiwirox.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/12109776199.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108129606fa7---majosotoredufoxavipime.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0800fed0d58fb012b6f8821d56522d8d/majegorebivodor.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21061217124362882252wrc6.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/xonenizamobaxi.pdfIn PDF document text
    • https://gangnampools.com/contents//files/61925385260.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a06c732a4348ef9ae7f549e5c2597a2d/75083927601.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/wikikonufutajaxerojogev.pdfIn PDF document text
    • http://someteme.com/archivos/_20210812040741.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828984cfc00---doxumugunoxemixajepi.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/50028018050.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba517ada3---xakefodixa.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/87316185048.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/gowaboxemububalexap.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5d79d24d---xovotafezefubinapujuno.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xipexej.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ee5d0475d7599a0636067592e545bf3a/sirepapa.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_off0000b9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 16752 bytes
SHA-256: c03e9343dc1684514ef01238d47588bd292323c74722672f2ec68e99c4f4ed3e
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10708 bytes
SHA-256: 5a7339998b8799eb7189e07e296cc5044144c956c6645afdb3cd0bb62d26577d
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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