Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9666f03f2f3764…

MALICIOUS

PDF

95.4 KB Created: 2021-08-22 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8143b8242da452d820f77e840c0132f8 SHA-1: afb4ef594ec332c87828f55df2b21b885a5034b1 SHA-256: 0e9666f03f2f3764d891b3f359b507e90b2e1679443e69e02385a8bd27864d65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=cuanto+es+10+milimetros+en+pulgadas PDF link annotation
    • http://samtle.net/ckupload/files/42031293499.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/pekavimakujovov.pdfIn PDF document text
    • http://liyangah.com/Upload/file/dodupumowowuxexux.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8bff3ffa---gerenipenikodejajofi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee00a2688---tisibex.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f3527d210---weluzav.pdfPDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ea8e4567---sijutugitu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449852d5a0---fifedezinerejajosogaporot.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/xipudawojumawebonoforu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b577dbbd98d---5162722020.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kefamufupogepiboropizoxor.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e552ae028---duvazisatubujadabuva.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bfe7297b8ad91cbedea94c53a836bd9f/luwavosakoxiratexete.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/37402722265.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/kamizejotawiga.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702291cfb4---femifukisivun.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/j7eua6e7qa05v7tcng9ii749p8/88106459774.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8549167---5850374043.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2c9b29a8032c601114046c4fd5cc795a/jekupudukanitewegugirubi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4f4accf1---wekuzejosumowotim.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ba2916c5aca1331b8fd0e3b27de40de4/wawunasefijegagovivoranow.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/nufabamuvuvugum.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/17711154150.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094829a0c5c3---guropesovom.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/lukonelijufifitak.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/32385509968.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_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 17124 bytes
SHA-256: 26a982a9da6b3b7b4f07e1e5a80a3d5a19a3d80648740dd2f1604e0c3ec5dad8
font_02_sfnt_off00015345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15345 11040 bytes
SHA-256: f091f42ab3b9593dea03153a2087309fa7a30519aaca8098b28c6edde192a172

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