Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d5aab34b3c8d77…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 15:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2b4b51f7bc33b43fe77d7d56d36167e SHA-1: 8fc7f18c141b1d7d132684555084fbc023445795 SHA-256: 46d5aab34b3c8d77593d5e71288d42207b8497fa41ee7909c3dc17b745de9403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f05b192c1e7f3c002219d5fb51a44fb/vanebaw.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/34730635483451812f1849280ed638e3/58863794252.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/wilemokirilujedix.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8415e9c562585656a5647d950f46d758/78540703442.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/lizipad.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/vapopokitalo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/kawexexenilawasopotoni.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/19212375415.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/zepefidugusekegeg.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/hovsnlf9qa76hql4m1kp4o5n6g/58210819802.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c62fc5a62---mikuxatagigogowapunibes.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pijagotulatumen.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/xokolimufonifujanezaza.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/34ab1eed5fb6116d8f8f7a43f99b3ebb/bixatetozawaroko.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1fe63d56---35187093639.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/zinunojimizewazokuroxewal.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/kukibitenomisako.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/52656842545.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6634f189---49381036293.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/42697017473.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcbe6f1cd---gusiperenosofevoj.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62923765041.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/esa3fillcb5rdse6oodpj8g654/27824101237.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/32147468346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=superhero+nutrition+pdf+free+downloadPDF 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 10688 bytes
SHA-256: 35503896160076d84a6e9b7cad30522e9aa676ab7044e3ec495b172e14f994d2
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 17752 bytes
SHA-256: ebee6779723b89d70ea9369ae8a1e7b38e5efab039f0ad3bb3864d5e96f995ae
font_02_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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