Malicious PDF — malware analysis report

Static analysis result for SHA-256 3024bd540603a93c…

MALICIOUS

PDF

76.6 KB Created: 2021-06-10 13:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 270b72d4426d45ba44620b36ad92ee8b SHA-1: bd351fd2a4c63222c51d3c6d02d9a0d7327cde1d SHA-256: 3024bd540603a93c0e8020f3675cb4f4f24bf221df7f22b3fcf5f2b1d98cb607
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the file being part of a link farm hosted on compromised WordPress sites, designed to redirect users to malicious PDFs. The presence of embedded URLs and the nature of the heuristics suggest this PDF is a lure to download further malicious content, likely via a compromised CMS upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=astm+d3330+pdf PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68e399aa105463c9f8d5c1fac94bcef9/nedagemogulidamejuxejoz.pdfIn PDF document text
    • http://diaochue.vn/userfiles/file/45429757162.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o32ietohh4s79jabg6qq7q236/juxupiniturufig.pdfIn PDF document text
    • https://elektrona.cz/files/file/waxuzejege.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853d39edd---jidedifetubujuzifux.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/miuqh30m98llivfv95q5p8ar73/25525715493.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/62646225923.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607515595c498---37928928389.pdfIn PDF document text
    • https://x-software.cz/data/file/lileje.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b497be429c---67316738387.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7bec393e6---daxelafajebesibixefa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d0ec0a5fb---daxepinafopovufesosane.pdfPDF link annotation
    • http://tomaszfilipczak.pl/userfiles/file/mibonenekumaxiwofiv.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/12955009281.pdfIn PDF document text
    • http://atomleasing.ru/media/File/73050366662.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4819e2a6d2---mijopixaveret.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 4548 bytes
SHA-256: 0c19af6157ae0feec1053fa7abda9b3f76e353931ef82939264675b8a01245e3
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11332 bytes
SHA-256: ac1a19225b1f5dc6200404677e342dcba19304c3c1f431b89820b5b207e20685
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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