Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed0f5687cb4c2d3…

MALICIOUS

PDF

90.4 KB Created: 2021-07-28 03:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b01e62e9484d1c00d40847ac3c92c82a SHA-1: 069142546c91fb29a7de27046a96fc59dac8ab7a SHA-256: 9ed0f5687cb4c2d3d9a90a726d601314aa2cf70953b943429be688d22cd39f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://copy2d.com/ftp/image/file/lekezerajaxer.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/l51dvjerqhqnhaf7j0llgk034i/lalaxipizorex.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ca40ffe3---76530083769.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/44351845077.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5419b04c69---69655737929.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/r3t7ae7dd2di38s8hbnm6jvo47/22447783120.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/xogexenutite.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/38092165784.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lerolitof.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/vizefopokupawamedilag.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/lalimuzitijo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/q717bd68nvavo4gjiih47ptjbu/6065916078.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/6235afec8a7fbe15f62f4d0d2dea3694/71526098075.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/33188208866.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608357577ef58---37105857578.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f79c0adf---76579472506.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607907d20a5f0---lumowala.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0fd6038e5b289e3b1670da6051d0528c/tebavemulatubetuwefen.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f79fd62d32f86b099b5f1805ceaed6b2/48812904732.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6546c29521---somobopuwus.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/xivajewuvufukinux.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/32720347079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=como+convertir+una+fraccion+a+decimal+calculadoraPDF 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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10664 bytes
SHA-256: 1ceb636d8127b8a20b87920d9f071fa6d9b57864f08cf891d1070cba6bc49c65
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 20552 bytes
SHA-256: 83911d654b9deca9c055f59863b1c7cc84aa0fa43c4ae256fa6fe60c11912e41
font_02_sfnt_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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