Malicious PDF — malware analysis report

Static analysis result for SHA-256 862c53b649a7eda4…

MALICIOUS

PDF

101.8 KB Created: 2021-07-02 16:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4365abc1a13f48f2b1fc0cce30bcb05f SHA-1: 584d94f9cbda5507c21c147f0e07dafeb6599524 SHA-256: 862c53b649a7eda456cd39e562b8434f36bfd6f57bde95cb6717bf7992dd5e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=cutaneous+small+vessel+vasculitis+treatment PDF link annotation
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3787ad1cdb---vovubejape.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/51313109215.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2128944e143aa5b2cb62be239502ee05/57690688684.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be89933f8---demoguvorowudulak.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60d8ce38764e7.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0lt8uoobv0991eul1e61fm1d7i/jabumewuwe.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b1e3aaa9f31.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc276f63f---gesovogumikutoxile.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074313129941---59543032180.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/sebemefasonujazulogu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64362d81f7---bagaridakusulutugepoled.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074627439934---27411788888.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cqqflvghurpr08c4k6cujaijsg/76289857307.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/logupedodofegedatofofupij.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c435d11c358---gozajudemikarov.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/340341462.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jiteruxojadidul.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jozudi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3d326ae0c---befepepowanilafemigoxog.pdfIn PDF document text
    • http://springbook.no/files/jizajumulexipoji.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/rexozubivo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9439286dedf35e93fbf552e94f8c6863/jojivebexuxabikuriwekaza.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_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 17896 bytes
SHA-256: 55f3f7be34e659aa99253433621b0e1e4f64b44ea80fa2f17bce67e85b0948ed
font_01_sfnt_off00015970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17187 10588 bytes
SHA-256: 5daa7c8fb2d805fac390e0efaefd28c736001fa616334db376b49d5f3116b2f2

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