Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dfe297b9f7ef4a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 07:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4f6b0b34fa08f7ee77ebd2da7ad9e8c SHA-1: 0ef457fbd599812c552100f63f4eb1ebfd447589 SHA-256: d8dfe297b9f7ef4a2af14ed01b2160538478d453ab2a7d65be3990f4ac402c1a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gruppocinofilomarsalese.com/userfiles/files/jatibilawaludoxepo.pdf In PDF document text
    • https://bokaichenyu.com/upload/files/wapigezamepakovolizi.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kunofebilawimixi.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b36eae7a60f---51968226295.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8534efccb---58797929585.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/25001783651.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cf933666fc7af9ec3f87e890749e566b/61605870814.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/2916914759.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/tesuvujefim.pdfIn PDF document text
    • http://chapelguild.com/images/usr/24819978472.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/legesonejegagepatosabakug.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/buzuzegekukurowow.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/vifixowedivalorob.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/1143263301.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb31f42e4e6---vewijotefotomakiroxa.pdfIn PDF document text
    • http://potlista.com/file/files/simemigudezo.pdfIn PDF document text
    • https://jss-moms.si/upload/File/gokivumitemoletivi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/19mmdkjqn747s3l95mn2p9svs1/74739524138.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b164ed6db1e---xuwilufivoneta.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/kutetolu.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/13652768160cb0c6204e42.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/92983388202.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a300109fbc2---vijarevozixenubuto.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/89623014538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=material+science+and+metallurgy+notesPDF 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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 18652 bytes
SHA-256: f685c837697a7912d9835410722cb0b23d1deb53912deb135647c7d44def9164
font_01_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10920 bytes
SHA-256: 034048dbedfbd908212b735c0b776c4a2ec931da3c73c734cd5cb07aa1eee692
font_02_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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